Below error is logged in dtrace:
Event ID: 41687 Failed to create the index snapshot in the index snapshot repository 'a59b29c8-4037-40ac-ac01-e27efd4826dc' on the Enterprise Vault index server '1F98BD36953BB1240A8244EDDC47F12A01410000EV01' due to the error 'Elasticsearch 'Snapshot.Create' API failed due to error 'Maximum timeout reached while retrying request. Call: Status code unknown from: PUT /_snapshot/a59b29c8-4037-40ac-ac01-e27efd4826dc/bd59dcfe-7020-446b-a7f3-9323cddbca87?wait_for_completion=true'.'.
This issue occurs due to the fact that the elastic search index snapshot process has a hardcoded timeout setting of 24 hours.
This issue has been addressed in Enterprise Vault 14.4.