CustomFieldIndexerAdapter does not delegate correctly wrapped object

Issue Summary

Having multiple indexers with the same id registered via multiple custom fields might cause the issue with reindexing due to CustomFieldIndexerAdapter doesn't delegate correctly.

Context:

• It uses equals() and hashCode() from Object instead of delegating to the wrapped object which means that custom field indexers returned from com.atlassian.jira.issue.index.managers.FieldIndexerManagerImpl.getAllIssueIndexers() are no longer deduped.

Expected Results

CustomFieldIndexerAdapter delegates correctly

Actual Results

CustomFieldIndexerAdapter doesn't delegate correctly

The below exception is thrown in the Jira file during reindexing:

java.lang.IllegalArgumentException: DocValuesField "sr_num_atch" appears more than once in this document (only one value is allowed per field)

Workaround

None