Reindex is failing with the following error

2026-07-22 14:59:12,381+0000 IssueIndexer:thread-1 WARN      [c.a.jira.index.AccumulatingResultBuilder] Indexing failed for Issue - '10100'
2026-07-22 14:59:12,381+0000 IssueIndexer:thread-1 WARN      [c.a.jira.index.AccumulatingResultBuilder] DocValuesField "customfield_10300" is too large, must be <= 32766
java.lang.IllegalArgumentException: DocValuesField "customfield_10300" is too large, must be <= 32766

This error was previously fixed by the following tickets but can still happen on certain scenarios

• https://jira.atlassian.com/browse/JSWSERVER-20133
• https://jira.atlassian.com/browse/JRASERVER-76392

Steps to reproduce

1. Have a Jira instance with Oracle DB and Jira Misc Custom Field plugin
2. Create a Multi line text field using the "Exact text searcher" provided by JMCF.
3. Add a huge value with special characters (ie. emojis)
4. Run a locked reindex

Expected result
Jira completes the indexing without errors, removing the huge field from lucene if needed.
A log message is still emitted to warn the app developer.

Actual result
Reindex fails with the error above.

Workaround
There are 2 options

1. Use the "Free text searcher" in the custom field
2. Remove some/all special characters