Surface required solrMajorVersion in helm/solr chart

Adds a new `solrMajorVersion` value (default 9, matching the default
image.tag of 9.10.0) and renders it under spec.solrMajorVersion. Uses
Helm's `required` so the chart fails fast with a clear message if a
user explicitly unsets it. Documents the new value in the chart README
and adds a v0.10.0 upgrade note covering both the CRD field and the
new chart value.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: danielmeint

docs/upgrade-notes.md

@@ -126,6 +126,11 @@ _Note that the Helm chart version does not contain a `v` prefix, which the downl
 ## Upgrade Warnings and Notes
 
 ### v0.10.0
+- **`SolrCloud.spec.solrMajorVersion` is now required**
+  A new required field `spec.solrMajorVersion` (int, 8–10) drives version-specific operator behavior for Solr 10 support.
+  Existing SolrCloud CRs must add this field (e.g. `solrMajorVersion: 9`) before upgrading the operator; CRD validation rejects CRs that omit it.
+  The `helm/solr` chart exposes a new `solrMajorVersion` value (default `9`) that must be bumped to `10` when running a Solr 10.x image.
+
 - **Logging now defaults to JSON format**
   The new default for CLI flag `--zap-devel` is now `false`, causing log encoding to be `json` and log level to be `info`.
   There is a new helm value `development` that can be set to `true` to switch to `console` encoding and `debug` level

helm/solr/README.md

@@ -85,6 +85,7 @@ Descriptions on how to use these options can be found in the [SolrCloud document
 | image.tag | string | `"9.10.0"` | The tag/version of Solr to run |
 | image.pullPolicy | string | | PullPolicy for the Solr image, defaults to the empty Pod behavior |
 | image.imagePullSecret | string | | PullSecret for the Solr image |
+| solrMajorVersion | int | `9` | Solr major version (8, 9, or 10). Required by the operator; must match `image.tag`'s major version. When pointing `image.tag` at a Solr 10.x image, set this to `10`. |
 | busyBoxImage.repository | string | `"busybox"` | The repository of the BusyBox image |
 | busyBoxImage.tag | string | `"1.28.0-glibc"` | The tag/version of BusyBox to run |
 | busyBoxImage.pullPolicy | string | | PullPolicy for the BusyBox image, defaults to the empty Pod behavior |

helm/solr/templates/solrcloud.yaml

@@ -24,6 +24,7 @@ spec:
   {{- if (quote .Values.replicas) }}
   replicas: {{ .Values.replicas }}
   {{- end }}
+  solrMajorVersion: {{ required "solrMajorVersion is required (8, 9, or 10) and must match image.tag's major version" .Values.solrMajorVersion }}
   {{- if .Values.image }}
   solrImage:
     {{- if .Values.image.repository }}

helm/solr/values.yaml

@@ -46,6 +46,11 @@ image:
   pullPolicy: ""
   imagePullSecret: ""
 
+# Solr major version (8, 9, or 10). Required by the operator; must match the
+# major version of image.tag. Defaults to 9 to match the default image.tag.
+# When pointing image.tag at a Solr 10.x image, set this to 10.
+solrMajorVersion: 9
+
 busyBoxImage: {}
   # repository: "busybox"
   # tag: "1.28.0-glibc"