Figure-3: Indexes List View - Errors
1. Errored Index
An indexing error can occur when the indexing-function is malformed or when the document data is corrupted/missing.
Once the index errors rate exceeds a certain rate, the index state will be marked with 'Error' and queries can't be made to it.
Resetting the index will re-index all documents matching its definition and clear the previous errors.
In the above example, Index 'Cities/Details' state is 'Error' as 500 errors were encountered.
See more in Degugging Index Errors
2. Faulty Index
When an index is already defined but the server fails to open its index data file from disk, or if this file is corrupted,
then the server will mark the index as Faulty, indicating that something is wrong with this index data files.
If the issue with the index's data file is resolved, you can click 'Open Index' (label '3' in above figure),
so that the index is processed again.
A possible solution is to reset the index - restart the indexing process from scratch,
so that new data files for the index are created, replacing the corrupted ones.
Note: The detailed errors list can be found in the Index Errors view.