core/filtermaps: revert to unindexed mode in case of indexing error #31500
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This PR changes log indexer error handling so that if an indexing error happens then it disables the indexer and reverts to unindexed more without resetting the database (except in case of a failed database init).
Resetting the database on the first error would probably be overkill as a client update might fix this without having to reindex the entire history. It would also make debugging very hard. On the other hand, these errors do not resolve themselves automatically so constantly retrying makes no sense either. With these changes a new attempt to resume indexing is made every time the client is restarted.
The PR also fixes #31491 which originated from the tail indexer trying to resume processing a failed map renderer.