capture partial success on audit log on Indexer service

Indexer service allows partial indexing of record if there are issues with schema or record parsing. Indexer service currently does not capture audit log for those indexing request.

This change set adds a method to enable these types of audit log. It also fixes severity of indexed record status, earlier it was overriding with lower severity.

Related Indexer service MR: osdu/platform/system/indexer-service!699 (merged)