Why does Kibana show visualization/dashboard for only (y-x) index’s data in case of shard failure?
This will happen mostly when you have old index data in Txnstore. After that you add new fields, creating reports using that field and you forgot to add mappings for that new field in old indexes.
Knowledge Base URL - Kibana Reporting
In addition to Mantri’s response, you can add additional fields to old indices through postman.
Refer Troubleshooting Knowledge base for more information -