Migration from elasticsearch to version 7.4.0 causes index mismatch issue:
elasticsearch | "Caused by: java.lang.IllegalStateException: The index [[test_ur_1571328204079/AEUZ3-IbQw-Av8cik7D4Mw]] was created with version [5.6.14] but the minimum compatible version is [6.0.0-beta1]. It should be re-indexed in Elasticsearch 6.x before upgrading to 7.4.0.",
It will be necessary to re-reindex, but with risk of data loss.
Migration from elasticsearch to version 7.4.0 causes index mismatch issue:
It will be necessary to re-reindex, but with risk of data loss.