diff --git a/Dockerfile b/Dockerfile
index 120a96f..7bfc7bf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,18 +1,25 @@
 # https://solr.apache.org/guide/8_9/taking-solr-to-production.html
-FROM solr:8.11.4
+ARG SOLR_VERSION=9.9.0
+FROM solr:$SOLR_VERSION
+ARG SOLR_VERSION
 
 ENV SOLR_CORE_DIR=${SOLR_HOME}/islandora8
 
 EXPOSE 8983
 
-COPY --link --chown=${SOLR_UID}:${SOLR_GID} islandora8/. ${SOLR_CORE_DIR} 
+COPY --link --chown=${SOLR_UID}:${SOLR_GID} islandora8/. ${SOLR_CORE_DIR}
 
 # renovate: datasource=github-releases depName=dbmdz/solr-ocrhighlighting
 ARG SOLR_OCRHIGHLIGHTING_VERSION=0.9.4
 USER root
-ENV SOLR_HOCR_PLUGIN_PATH=/opt/solr_extra_lib/ocrhighlighting/lib
-RUN mkdir -p $SOLR_HOCR_PLUGIN_PATH
-ADD --link --chown=0:${SOLR_GID} --chmod=040 https://github.com/dbmdz/solr-ocrhighlighting/releases/download/$SOLR_OCRHIGHLIGHTING_VERSION/solr-ocrhighlighting-$SOLR_OCRHIGHLIGHTING_VERSION-solr78.jar $SOLR_HOCR_PLUGIN_PATH
+
+ARG SOLR_PATH=/opt/solr-${SOLR_VERSION}
+ENV SOLR_HOCR_PLUGIN_PATH=$SOLR_PATH/lib
+
+# extraction,langid,ltr,analysis-extras are required by search_api_solr, so
+# let's set 'em by default.
+ENV SOLR_MODULES=extraction,langid,ltr,analysis-extras
+ADD --link --chown=0:0 --chmod=444 https://github.com/dbmdz/solr-ocrhighlighting/releases/download/$SOLR_OCRHIGHLIGHTING_VERSION/solr-ocrhighlighting-$SOLR_OCRHIGHLIGHTING_VERSION.jar $SOLR_HOCR_PLUGIN_PATH/
 USER solr
 
 # https://solr.apache.org/guide/8_9/basic-authentication-plugin.html
diff --git a/islandora8/conf/schema.xml b/islandora8/conf/schema.xml
index 1382385..bc22c9e 100644
--- a/islandora8/conf/schema.xml
+++ b/islandora8/conf/schema.xml
@@ -30,7 +30,7 @@
  It should be kept correct and concise, usable out-of-the-box.
 
  For more information, on how to customize this file, please see
- http://wiki.apache.org/solr/SchemaXml
+ https://solr.apache.org/guide/solr/latest/indexing-guide/schema-elements.html
 
  PERFORMANCE NOTE: this schema includes many optional features and should not
  be used for benchmarking.  To improve performance one could
@@ -49,7 +49,7 @@
     that avoids logging every request
 -->
 
-<schema name="drupal-4.3.7-solr-8.x-0" version="1.6">
+<schema name="drupal-4.3.10-solr-9.x-0" version="1.6">
   <!-- attribute "name" is the name of this schema and is only used for display purposes.
        version="x.y" is Solr's version number for the schema syntax and
        semantics.  It should not normally be changed by applications.
@@ -122,7 +122,9 @@
   <!-- points to the root document of a block of nested documents. Required for nested
      document support, may be removed otherwise
   -->
-  <field name="_root_" type="string" indexed="true" stored="false" docValues="false"/>
+  <field name="_root_" type="string" indexed="true" stored="true" docValues="false" />
+  <fieldType name="_nest_path_" class="solr.NestPathField" />
+  <field name="_nest_path_" type="_nest_path_" />
 
   <!-- Only remove the "id" field if you have a very good reason to. While not strictly
   required, it is highly recommended. A <uniqueKey> is present in almost all Solr
@@ -156,7 +158,7 @@
 
   <!-- Currently the suggester context filter query (suggest.cfq) accesses the tags using the stored values, neither the indexed terms nor the docValues.
        Therefore the dynamicField sm_* isn't suitable at the moment -->
-  <field name="sm_context_tags" type="string" indexed="true" stored="true" multiValued="true" docValues="false"/>
+  <field name="sm_context_tags" type="strings" indexed="true" stored="true" docValues="false"/>
 
   <!-- Dynamic field definitions.  If a field name is not found, dynamicFields
        will be used if the name matches any of the patterns.
@@ -170,59 +172,59 @@
        the last letter is 's' for single valued, 'm' for multi-valued -->
 
   <!-- We use plong for integer since 64 bit ints are now common in PHP. -->
-  <dynamicField name="is_*"  type="plong"    indexed="true"  stored="false" multiValued="false" docValues="true" termVectors="true"/>
-  <dynamicField name="im_*"  type="plong"    indexed="true"  stored="false" multiValued="true" docValues="true" termVectors="true"/>
+  <dynamicField name="is_*" type="plong" indexed="true" stored="false" docValues="true" termVectors="true"/>
+  <dynamicField name="im_*" type="plongs" indexed="true" stored="false" docValues="true" termVectors="true"/>
   <!-- List of floats can be saved in a regular float field -->
-  <dynamicField name="fs_*"  type="pfloat"   indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="fm_*"  type="pfloat"   indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="fs_*" type="pfloat" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="fm_*" type="pfloats" indexed="true" stored="false" docValues="true"/>
   <!-- List of doubles can be saved in a regular double field -->
-  <dynamicField name="ps_*"  type="pdouble"   indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="pm_*"  type="pdouble"   indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="ps_*" type="pdouble" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="pm_*" type="pdoubles" indexed="true" stored="false" docValues="true"/>
   <!-- List of booleans can be saved in a regular boolean field -->
-  <dynamicField name="bm_*"  type="boolean" indexed="true"  stored="false" multiValued="true" docValues="true" termVectors="true"/>
-  <dynamicField name="bs_*"  type="boolean" indexed="true"  stored="false" multiValued="false" docValues="true" termVectors="true"/>
+  <dynamicField name="bm_*" type="booleans" indexed="true" stored="false" docValues="true" termVectors="true"/>
+  <dynamicField name="bs_*" type="boolean" indexed="true" stored="false" docValues="true" termVectors="true"/>
   <!-- Regular text (without processing) can be stored in a string field-->
-  <dynamicField name="ss_*"  type="string"  indexed="true"  stored="false" multiValued="false" docValues="true" termVectors="true"/>
+  <dynamicField name="ss_*" type="string" indexed="true" stored="false" docValues="true" termVectors="true"/>
   <!-- For field types using SORTED_SET, multiple identical entries are collapsed into a single value.
        Thus if I insert values 4, 5, 2, 4, 1, my return will be 1, 2, 4, 5 when enabling docValues.
        If you need to preserve the order and duplicate entries, consider to store the values as zm_* (twice). -->
-  <dynamicField name="sm_*"  type="string"  indexed="true"  stored="false" multiValued="true" docValues="true" termVectors="true"/>
+  <dynamicField name="sm_*" type="strings" indexed="true" stored="false" docValues="true" termVectors="true"/>
   <!-- Special-purpose text fields -->
   <dynamicField name="tws_*" type="text_ws" indexed="true" stored="true" multiValued="false"/>
   <dynamicField name="twm_*" type="text_ws" indexed="true" stored="true" multiValued="true"/>
 
-  <dynamicField name="ds_*"  type="pdate"   indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="dm_*"  type="pdate"   indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="ds_*" type="pdate" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="dm_*" type="pdates" indexed="true" stored="false" docValues="true"/>
   <!-- This field is used to store date ranges -->
-  <dynamicField name="drs_*" type="date_range" indexed="true" stored="true" multiValued="false"/>
-  <dynamicField name="drm_*" type="date_range" indexed="true" stored="true" multiValued="true"/>
+  <dynamicField name="drs_*" type="date_range" indexed="true" stored="true"/>
+  <dynamicField name="drm_*" type="date_ranges" indexed="true" stored="true"/>
   <!-- Trie fields are deprecated. Point fields solve all needs. But we keep the dedicated field names for backward compatibility. -->
-  <dynamicField name="its_*" type="plong"   indexed="true"  stored="false" multiValued="false" docValues="true" termVectors="true"/>
-  <dynamicField name="itm_*" type="plong"   indexed="true"  stored="false" multiValued="true" docValues="true" termVectors="true"/>
-  <dynamicField name="fts_*" type="pfloat"  indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="ftm_*" type="pfloat"  indexed="true"  stored="false" multiValued="true" docValues="true"/>
-  <dynamicField name="pts_*" type="pdouble" indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="ptm_*" type="pdouble" indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="its_*" type="plong" indexed="true" stored="false" docValues="true" termVectors="true"/>
+  <dynamicField name="itm_*" type="plongs" indexed="true" stored="false" docValues="true" termVectors="true"/>
+  <dynamicField name="fts_*" type="pfloat" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="ftm_*" type="pfloats" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="pts_*" type="pdouble" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="ptm_*" type="pdoubles" indexed="true" stored="false" docValues="true"/>
   <!-- Binary fields can be populated using base64 encoded data. Useful e.g. for embedding
        a small image in a search result using the data URI scheme -->
-  <dynamicField name="xs_*"  type="binary"  indexed="false" stored="true" multiValued="false"/>
-  <dynamicField name="xm_*"  type="binary"  indexed="false" stored="true" multiValued="true"/>
+  <dynamicField name="xs_*" type="binary" indexed="false" stored="true" multiValued="false"/>
+  <dynamicField name="xm_*" type="binary" indexed="false" stored="true" multiValued="true"/>
   <!-- Trie fields are deprecated. Point fields solve all needs. But we keep the dedicated field names for backward compatibility. -->
-  <dynamicField name="dds_*" type="pdate"    indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="ddm_*" type="pdate"    indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="dds_*" type="pdate" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="ddm_*" type="pdates" indexed="true" stored="false" docValues="true"/>
   <!-- In case a 32 bit int is really needed, we provide these fields. 'h' is mnemonic for 'half word', i.e. 32 bit on 64 arch -->
-  <dynamicField name="hs_*" type="pint" indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="hm_*" type="pint" indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="hs_*" type="pint" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="hm_*" type="pints" indexed="true" stored="false" docValues="true"/>
   <!-- Trie fields are deprecated. Point fields solve all needs. But we keep the dedicated field names for backward compatibility. -->
-  <dynamicField name="hts_*" type="pint"   indexed="true"  stored="false" multiValued="false" docValues="true"/>
-  <dynamicField name="htm_*" type="pint"   indexed="true"  stored="false" multiValued="true" docValues="true"/>
+  <dynamicField name="hts_*" type="pint" indexed="true" stored="false" docValues="true"/>
+  <dynamicField name="htm_*" type="pints" indexed="true" stored="false" docValues="true"/>
 
   <!-- Unindexed string fields that can be used to store values that won't be searchable but have docValues -->
-  <dynamicField name="zdvs_*" type="string" indexed="false" stored="true" multiValued="false" docValues="true"/>
-  <dynamicField name="zdvm_*" type="string" indexed="false" stored="true" multiValued="true" docValues="true"/>
+  <dynamicField name="zdvs_*" type="string" indexed="false" stored="true" docValues="true"/>
+  <dynamicField name="zdvm_*" type="strings" indexed="false" stored="true" docValues="true"/>
   <!-- Unindexed string fields that can be used to store values that won't be searchable -->
-  <dynamicField name="zs_*" type="string"   indexed="false"  stored="true" multiValued="false"/>
-  <dynamicField name="zm_*" type="string"   indexed="false"  stored="true" multiValued="true"/>
+  <dynamicField name="zs_*" type="string" indexed="false" stored="true"/>
+  <dynamicField name="zm_*" type="strings" indexed="false" stored="true"/>
 
   <!-- Fields for location searches.
        http://wiki.apache.org/solr/SpatialSearch#geodist_-_The_distance_function -->
@@ -267,9 +269,11 @@
        single-valued and either required or have a default value.
       -->
     <fieldType name="string" class="solr.StrField"/>
+    <fieldType name="strings" class="solr.StrField" multiValued="true"/>
 
     <!-- boolean type: "true" or "false" -->
     <fieldType name="boolean" class="solr.BoolField"/>
+    <fieldType name="booleans" class="solr.BoolField" multiValued="true"/>
 
     <!-- sortMissingLast and sortMissingFirst attributes are optional attributes are
          currently supported on types that are sorted internally as strings
@@ -334,6 +338,7 @@
 
     <!-- A date range field -->
     <fieldType name="date_range" class="solr.DateRangeField"/>
+    <fieldType name="date_ranges" class="solr.DateRangeField" multiValued="true"/>
 
     <!--Binary data type. The data should be sent/retrieved in as Base64 encoded Strings -->
     <fieldType name="binary" class="solr.BinaryField"/>
@@ -372,7 +377,7 @@
     -->
 
     <!-- A text field that only splits on whitespace for exact matching of words -->
-    <fieldType name="text_ws" class="solr.TextField" omitNorms="true" positionIncrementGap="100">
+    <fieldType name="text_ws" class="solr.TextField" omitNorms="true" positionIncrementGap="100" storeOffsetsWithPositions="true">
       <analyzer>
         <tokenizer class="solr.WhitespaceTokenizerFactory"/>
         <filter class="solr.LowerCaseFilterFactory"/>
diff --git a/islandora8/conf/schema_extra_types.xml b/islandora8/conf/schema_extra_types.xml
index 3d52bb0..6333428 100644
--- a/islandora8/conf/schema_extra_types.xml
+++ b/islandora8/conf/schema_extra_types.xml
@@ -2,7 +2,7 @@
   Edge NGram String Field
   6.0.0
 -->
-<fieldType name="text_edgenstring" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_edgenstring" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
     <tokenizer class="solr.KeywordTokenizerFactory"/>
     <filter class="solr.LowerCaseFilterFactory"/>
@@ -19,12 +19,13 @@
   Edge NGram Text Field
   7.0.0
 -->
-<fieldType name="text_edge" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_edge" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_und.txt"/>
     <filter class="solr.WordDelimiterGraphFilterFactory" catenateNumbers="1" generateNumberParts="1" protected="protwords_und.txt" splitOnCaseChange="0" generateWordParts="1" preserveOriginal="1" catenateAll="0" catenateWords="1"/>
+    <filter class="solr.FlattenGraphFilterFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
@@ -32,7 +33,7 @@
   </analyzer>
   <analyzer type="query">
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
@@ -99,18 +100,19 @@
   Fulltext Phonetic
   7.0.0
 -->
-<fieldType name="text_phonetic_und" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_phonetic_und" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_und.txt"/>
     <filter class="solr.WordDelimiterGraphFilterFactory" catenateNumbers="1" generateNumberParts="1" protected="protwords_und.txt" splitOnCaseChange="0" generateWordParts="1" preserveOriginal="1" catenateAll="0" catenateWords="1"/>
+    <filter class="solr.FlattenGraphFilterFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.BeiderMorseFilterFactory" languageSet="auto" nameType="GENERIC" ruleType="APPROX" concat="true"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
   </analyzer>
   <analyzer type="query">
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_und.txt"/>
     <filter class="solr.WordDelimiterGraphFilterFactory" catenateNumbers="0" generateNumberParts="1" protected="protwords_und.txt" splitOnCaseChange="0" generateWordParts="1" preserveOriginal="1" catenateAll="0" catenateWords="0"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
@@ -147,7 +149,7 @@
   Fulltext String Field
   6.0.0
 -->
-<fieldType name="text_string" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_string" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
     <tokenizer class="solr.PatternTokenizerFactory" pattern="[\t\r\n]"/>
     <filters/>
@@ -187,20 +189,21 @@
   Language Undefined Text Field
   7.0.0
 -->
-<fieldType name="text_und" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_und" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_und.txt"/>
     <filter class="solr.WordDelimiterGraphFilterFactory" catenateNumbers="1" generateNumberParts="1" protected="protwords_und.txt" splitOnCaseChange="0" generateWordParts="1" preserveOriginal="1" catenateAll="0" catenateWords="1"/>
+    <filter class="solr.FlattenGraphFilterFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
   </analyzer>
   <analyzer type="query">
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
-    <filter class="solr.SynonymGraphFilterFactory" ignoreCase="true" synonyms="synonyms_und.txt" expand="true"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
+    <filter class="solr.SynonymGraphFilterFactory" synonyms="synonyms_und.txt" expand="true" ignoreCase="true"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_und.txt"/>
     <filter class="solr.WordDelimiterGraphFilterFactory" catenateNumbers="0" generateNumberParts="1" protected="protwords_und.txt" splitOnCaseChange="0" generateWordParts="1" preserveOriginal="1" catenateAll="0" catenateWords="0"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
@@ -212,10 +215,10 @@
   Language Undefined Text Field spellcheck
   7.0.0
 -->
-<fieldType name="text_spell_und" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_spell_und" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer>
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
@@ -230,7 +233,7 @@
   NGram String Field
   6.0.0
 -->
-<fieldType name="text_ngramstring" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_ngramstring" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
     <tokenizer class="solr.KeywordTokenizerFactory"/>
     <filter class="solr.LowerCaseFilterFactory"/>
@@ -247,12 +250,13 @@
   NGram Text Field
   7.0.0
 -->
-<fieldType name="text_ngram" class="solr.TextField" positionIncrementGap="100">
+<fieldType name="text_ngram" class="solr.TextField" positionIncrementGap="100" storeOffsetsWithPositions="true">
   <analyzer type="index">
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_und.txt"/>
     <filter class="solr.WordDelimiterGraphFilterFactory" catenateNumbers="1" generateNumberParts="1" protected="protwords_und.txt" splitOnCaseChange="0" generateWordParts="1" preserveOriginal="1" catenateAll="0" catenateWords="1"/>
+    <filter class="solr.FlattenGraphFilterFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
@@ -260,7 +264,7 @@
   </analyzer>
   <analyzer type="query">
     <charFilter class="solr.MappingCharFilterFactory" mapping="accents_und.txt"/>
-    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
+    <tokenizer class="solr.StandardTokenizerFactory"/>
     <filter class="solr.LengthFilterFactory" min="2" max="100"/>
     <filter class="solr.LowerCaseFilterFactory"/>
     <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
diff --git a/islandora8/conf/solrconfig.xml b/islandora8/conf/solrconfig.xml
index c16e0cc..96ee058 100644
--- a/islandora8/conf/solrconfig.xml
+++ b/islandora8/conf/solrconfig.xml
@@ -9,9 +9,9 @@
 
 <!--
      For more details about configurations options that may appear in
-     this file, see http://wiki.apache.org/solr/SolrConfigXml.
+     this file, see https://solr.apache.org/guide/solr/latest/configuration-guide/configuring-solrconfig-xml.html
 -->
-<config name="drupal-4.3.7-solr-8.x-0" >
+<config name="drupal-4.3.10-solr-9.x-0" >
   <!-- In all configuration below, a prefix of "solr." for class names
        is an alias that causes solr to search appropriate packages,
        including org.apache.solr.(search|update|request|core|analysis)
@@ -38,7 +38,7 @@
        that you fully re-index after changing this setting as it can
        affect both how text is indexed and queried.
     -->
-  <luceneMatchVersion>${solr.luceneMatchVersion:LUCENE_80}</luceneMatchVersion>
+  <luceneMatchVersion>${solr.luceneMatchVersion:LUCENE_90}</luceneMatchVersion>
 
   <!-- <lib/> directives can be used to instruct Solr to load any Jars
        identified and use them to resolve any "plugins" specified in
@@ -72,20 +72,26 @@
        If a 'dir' option (with or without a regex) is used and nothing
        is found that matches, a warning will be logged.
 
-       The examples below can be used to load some solr-contribs along
-       with their external dependencies.
+       The examples below can be used to load some Solr Modules along
+       with their external dependencies as an alternative to using a
+       startup parameter to define the modules to load globally.  For more info
+       see https://solr.apache.org/guide/solr/latest/configuration-guide/solr-modules.html
     -->
-  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-dataimporthandler-.*\.jar" />
+  <!-- <lib/> directives are deprecated and will be removed in Solr 10.0.
+Ensure to load the required module in your Solr server, for example by appending it to the comma-separated module list enviroment variable like SOLR_MODULES="${SOLR_MODULES},extraction/" -->
+<!-- <lib dir="${solr.install.dir:../../../..}/modules/extraction/lib" regex=".*\.jar" /> -->
 
-  <lib dir="${solr.install.dir:../../../..}/contrib/extraction/lib" regex=".*\.jar" />
-  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-cell-\d.*\.jar" />
+  <!-- <lib/> directives are deprecated and will be removed in Solr 10.0.
+Ensure to load the required module in your Solr server, for example by appending it to the comma-separated module list enviroment variable like SOLR_MODULES="${SOLR_MODULES},langid/" -->
+<!-- <lib dir="${solr.install.dir:../../../..}/modules/langid/lib/" regex=".*\.jar" /> -->
 
-  <lib dir="${solr.install.dir:../../../..}/contrib/langid/lib/" regex=".*\.jar" />
-  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-langid-\d.*\.jar" />
+  <!-- <lib/> directives are deprecated and will be removed in Solr 10.0.
+Ensure to load the required module in your Solr server, for example by appending it to the comma-separated module list enviroment variable like SOLR_MODULES="${SOLR_MODULES},ltr/" -->
+<!-- <lib dir="${solr.install.dir:../../../..}/modules/ltr/lib/" regex=".*\.jar" /> -->
 
-  <lib dir="${solr.install.dir:../../../..}/contrib/analysis-extras/lib" regex=".*\.jar" />
-  <lib dir="${solr.install.dir:../../../..}/contrib/analysis-extras/lucene-libs" regex=".*\.jar" />
-  <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-analysis-extras-\d.*\.jar" />
+  <!-- <lib/> directives are deprecated and will be removed in Solr 10.0.
+Ensure to load the required module in your Solr server, for example by appending it to the comma-separated module list enviroment variable like SOLR_MODULES="${SOLR_MODULES},analysis-extras/" -->
+<!-- <lib dir="${solr.install.dir:../../../..}/modules/analysis-extras/lib/" regex=".*\.jar" /> -->
 
   <!-- an exact 'path' can be used instead of a 'dir' to specify a
        specific jar file.  This will cause a serious error to be logged
@@ -114,7 +120,7 @@
        for better NRT performance.
 
        One can force a particular implementation via solr.MMapDirectoryFactory,
-       solr.NIOFSDirectoryFactory, or solr.SimpleFSDirectoryFactory.
+       solr.NIOFSDirectoryFactory.
 
        solr.RAMDirectoryFactory is memory based and not persistent.
     -->
@@ -223,7 +229,7 @@
                    'simple' is the default
 
          More details on the nuances of each LockFactory...
-         http://wiki.apache.org/lucene-java/AvailableLockFactories
+         https://cwiki.apache.org/confluence/display/lucene/AvailableLockFactories
     -->
     <lockType>${solr.lock.type:native}</lockType>
 
@@ -284,6 +290,7 @@
                 solr data directory.  -->
     <updateLog>
       <str name="dir">${solr.ulog.dir:}</str>
+      <int name="numVersionBuckets">${solr.ulog.numVersionBuckets:65536}</int>
     </updateLog>
 
     <!-- AutoCommit
@@ -292,7 +299,7 @@
          Instead of enabling autoCommit, consider using "commitWithin"
          when adding documents.
 
-         http://wiki.apache.org/solr/UpdateXmlMessages
+         https://solr.apache.org/guide/solr/latest/indexing-guide/indexing-with-update-handlers.html
 
          maxDocs - Maximum number of documents to add since the last
                    commit before automatically triggering a new commit.
@@ -439,6 +446,51 @@
 
   </query>
 
+  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+     Circuit Breaker Section - This section consists of configurations for
+     circuit breakers
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
+  <!-- Circuit breakers are designed to allow stability and predictable query
+     execution. They prevent operations that can take down the node and cause
+     noisy neighbour issues.
+
+     The CircuitBreakerManager is the default manager for all circuit breakers.
+     The enabled flag here controls the activation/deactivation of all circuit
+     breakers specified within.
+  -->
+  <circuitBreaker class="solr.CircuitBreakerManager" enabled="true">
+    <!-- Memory Circuit Breaker
+
+     Specific configuration for max JVM heap usage circuit breaker. This configuration defines
+     whether the circuit breaker is enabled and the threshold percentage of maximum heap allocated
+     beyond which queries will be rejected until the current JVM usage goes below the threshold.
+     The valid value for this range is 50-95.
+
+     Consider a scenario where the max heap allocated is 4 GB and memThreshold is defined as 75.
+     Threshold JVM usage will be 4 * 0.75 = 3 GB. Its generally a good idea to keep this value
+     between 75 - 80% of maximum heap allocated.
+
+     If, at any point, the current JVM heap usage goes above 3 GB, queries will be rejected until
+     the heap usage goes below 3 GB again. If you see queries getting rejected with 503 error code,
+     check for "Circuit Breakers tripped" in logs and the corresponding error message should tell
+     you what transpired (if the failure was caused by tripped circuit breakers).
+    -->
+    <!--
+    <str name="memEnabled">true</str>
+    <str name="memThreshold">75</str>
+    -->
+
+    <!-- CPU Circuit Breaker Configuration
+
+     Specific configuration for CPU utilization based circuit breaker. This configuration defines
+     whether the circuit breaker is enabled and the average load over the last minute at which the
+     circuit breaker should start rejecting queries.
+    -->
+    <!--
+    <str name="cpuEnabled">true</str>
+    <str name="cpuThreshold">75</str>
+    -->
+  </circuitBreaker>
 
   <!-- Request Dispatcher
 
@@ -455,6 +507,9 @@
          enableRemoteStreaming - enables use of the stream.file
          and stream.url parameters for specifying remote streams.
 
+         enableStreamBody - This attribute controls whether streaming
+         content from the HTTP parameter stream.body is allowed.
+
          multipartUploadLimitInKB - specifies the max size (in KiB) of
          Multipart File Uploads that Solr will allow in a Request.
 
@@ -474,7 +529,8 @@
          Before enabling remote streaming, you should make sure your
          system has authentication enabled.
 
-    <requestParsers enableRemoteStreaming="false"
+    <requestParsers enableRemoteStreaming="true"
+                    enableStreamBody="true"
                     multipartUploadLimitInKB="-1"
                     formdataUploadLimitInKB="-1"
                     addHttpRequestToContext="false"/>
@@ -749,14 +805,6 @@
     </queryResponseWriter>
     -->
 
-  <!-- XSLT response writer transforms the XML output by any xslt file found
-       in Solr's conf/xslt directory.  Changes to xslt files are checked for
-       every xsltCacheLifetimeSeconds.
-    -->
-  <queryResponseWriter name="xslt" class="solr.XSLTResponseWriter">
-    <int name="xsltCacheLifetimeSeconds">5</int>
-  </queryResponseWriter>
-
   <!-- Query Parsers
 
        https://lucene.apache.org/solr/guide/query-syntax-and-parsing.html
diff --git a/islandora8/conf/solrconfig_extra.xml b/islandora8/conf/solrconfig_extra.xml
index 8b6fb65..47109f4 100644
--- a/islandora8/conf/solrconfig_extra.xml
+++ b/islandora8/conf/solrconfig_extra.xml
@@ -43,12 +43,13 @@
   
     <lst name="suggester">
       <str name="name">und</str>
+      <str name="indexPath">./und</str>
       <str name="lookupImpl">AnalyzingInfixLookupFactory</str>
       <str name="dictionaryImpl">DocumentDictionaryFactory</str>
       <str name="field">twm_suggest</str>
       <str name="suggestAnalyzerFieldType">text_und</str>
       <str name="contextField">sm_context_tags</str>
-      <str name="buildOnCommit">true</str>
+      <str name="buildOnCommit">false</str>
       <str name="buildOnStartup">false</str>
     </lst>
   </searchComponent>
@@ -217,4 +218,3 @@
   7.0.0
 -->
   <searchComponent name="tvComponent" class="solr.TermVectorComponent"/>
-<lib dir="${solr.hocr.plugin.path:/opt/solr_extra_lib/ocrhighlighting/lib}" regex=".*\.jar" />
diff --git a/islandora8/conf/solrconfig_query.xml b/islandora8/conf/solrconfig_query.xml
index 5bdd696..21261d2 100644
--- a/islandora8/conf/solrconfig_query.xml
+++ b/islandora8/conf/solrconfig_query.xml
@@ -1,46 +1,46 @@
 <!--
   Document Cache
-  7.0.0
+  9.0.0
 -->
-<documentCache class="solr.LRUCache" size="512" initialSize="512" autowarmCount="0"/>
+<documentCache class="solr.CaffeineCache" size="512" initialSize="512" autowarmCount="0"/>
 
 <!--
   Field Value Cache
-  7.0.0
+  9.0.0
 -->
-<fieldValueCache class="solr.FastLRUCache" size="512" autowarmCount="128" showItems="32"/>
+<fieldValueCache class="solr.CaffeineCache" size="512" autowarmCount="128" showItems="32"/>
 
 <!--
   Filter Cache
-  7.0.0
+  9.0.0
 -->
-<filterCache class="solr.FastLRUCache" size="512" initialSize="512" autowarmCount="0"/>
+<filterCache class="solr.CaffeineCache" size="512" initialSize="512" autowarmCount="0"/>
 
 <!--
   Per Segment Filter Cache
-  7.0.0
+  9.0.0
 -->
-<cache name="perSegFilter" class="solr.search.LRUCache" size="10" initialSize="0" autowarmCount="10" regenerator="solr.NoOpRegenerator"/>
+<cache name="perSegFilter" class="solr.CaffeineCache" size="10" initialSize="0" autowarmCount="10" regenerator="solr.NoOpRegenerator"/>
 
 <!--
   Query Result Cache
-  7.0.0
+  9.0.0
 -->
-<queryResultCache class="solr.LRUCache" size="512" initialSize="512" autowarmCount="0"/>
+<queryResultCache class="solr.CaffeineCache" size="512" initialSize="512" autowarmCount="0"/>
 
 <!--
   Special configs for Field Value Cache
-  7.0.0
+  9.0.0
 -->
   <query name="enableLazyFieldLoading">true</query>
 <!--
   Special configs for Filter Cache
-  7.0.0
+  9.0.0
 -->
   <query name="useFilterForSortedQuery">false</query>
 <!--
   Special configs for Query Result Cache
-  7.0.0
+  9.0.0
 -->
   <query name="queryResultWindowSize">20</query>
   <query name="queryResultMaxDocsCached">200</query>
diff --git a/islandora8/conf/solrcore.properties b/islandora8/conf/solrcore.properties
index 3957818..a8ad8c1 100644
--- a/islandora8/conf/solrcore.properties
+++ b/islandora8/conf/solrcore.properties
@@ -2,7 +2,7 @@ solr.replication.master=false
 solr.replication.slave=false
 solr.replication.pollInterval=00:00:60
 solr.replication.masterUrl=http://localhost:8983/solr
-solr.replication.confFiles=schema.xml,schema_extra_types.xml,schema_extra_fields.xml,elevate.xml,stopwords_en.txt,protwords_en.txt,accents_en.txt,synonyms_en.txt,stopwords_und.txt,protwords_und.txt,accents_und.txt,synonyms_und.txt
+solr.replication.confFiles=schema.xml,schema_extra_types.xml,schema_extra_fields.xml,elevate.xml,stopwords_en.txt,protwords_en.txt,accents_en.txt,synonyms_en.txt,stopwords_und.txt,synonyms_und.txt,protwords_und.txt,accents_und.txt
 solr.mlt.timeAllowed=2000
 solr.selectSearchHandler.timeAllowed=-1
 solr.autoCommit.MaxDocs=-1
@@ -10,4 +10,4 @@ solr.autoCommit.MaxTime=15000
 solr.autoSoftCommit.MaxDocs=-1
 solr.autoSoftCommit.MaxTime=5000
 solr.install.dir=/opt/solr
-solr.luceneMatchVersion=8.11.4
+solr.luceneMatchVersion=9.12.2
diff --git a/islandora8/data/.gitignore b/islandora8/data/.gitignore
new file mode 100644
index 0000000..72e8ffc
--- /dev/null
+++ b/islandora8/data/.gitignore
@@ -0,0 +1 @@
+*
diff --git a/islandora8/data/index/segments_1 b/islandora8/data/index/segments_1
deleted file mode 100644
index 6f729a3..0000000
Binary files a/islandora8/data/index/segments_1 and /dev/null differ
diff --git a/islandora8/data/index/write.lock b/islandora8/data/index/write.lock
deleted file mode 100644
index e69de29..0000000
diff --git a/solr.in.sh b/solr.in.sh
index a587bd5..9eae590 100644
--- a/solr.in.sh
+++ b/solr.in.sh
@@ -1,4 +1,3 @@
 # https://solr.apache.org/guide/8_1/basic-authentication-plugin.html#enable-basic-authentication
 SOLR_AUTH_TYPE=basic
 SOLR_AUTHENTICATION_OPTS=-Dbasicauth=drupal:drupal
-SOLR_OPTS="$SOLR_OPTS -Dsolr.hocr.plugin.path=${SOLR_HOCR_PLUGIN_PATH}"