gh-4169 Add change entry

Author: at055612

Diff for: unreleased_changes/20240320_121301_971__4169.md

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+* Issue **#4169** : Fix index field `Positions` setting not being passed through to Lucene resulting in corrupt shards.
+
+
+```sh
+# ********************************************************************************
+# Issue title: 7.3 Corrupting Index Shards 
+# Issue link:  https://github.com/gchq/stroom/issues/4169
+# ********************************************************************************
+
+# ONLY the top line will be included as a change entry in the CHANGELOG.
+# The entry should be in GitHub flavour markdown and should be written on a SINGLE
+# line with no hard breaks. You can have multiple change files for a single GitHub issue.
+# The  entry should be written in the imperative mood, i.e. 'Fix nasty bug' rather than
+# 'Fixed nasty bug'.
+#
+# Examples of acceptable entries are:
+#
+#
+# * Issue **123** : Fix bug with an associated GitHub issue in this repository
+#
+# * Issue **namespace/other-repo#456** : Fix bug with an associated GitHub issue in another repository
+#
+# * Fix bug with no associated GitHub issue.
+```