ELK 7.12.1
ROR 1.31.0 Enterprise
Since upgrading a one node cluster we are getting the following error in the logs:
[warning][plugins][ReadonlyREST][esIndexClient] Could not find a valid session in index for SID bf71b35d-f1a4-4aaf-99bf-ee0b837d502b (probably the cookiePass or internal format changed?)
Do you have any idea what could cause this?