just got the error after yum upgrade 2018-11-23T11:13:35.493+0100 ERROR pipeline/output.go:100 Failed to connect to backoff(elasticsearch( https://xxxxxxxxxx:9200/var/log/apm-server )): 404 Not Found: {"error":{"root_cause":[{"type":"index_not_found_exception","reason":"no such index","resource.t…

Tx Sylvia, i have open a call on support and we find the solution. It was logfile enabled commented when line of path was not commented.

APM upgrade 6.5.0 to 6.5.1

Lo_Tel (Lo Tel) November 23, 2018, 10:31am 2

monitoring is ok but the message of connection stay

Topic		Replies	Views
Trouble "reconnecting" APM after upgrade to 6.6.0 APM	5	760	March 1, 2019
APM Server has still not connected to Elasticsearch APM server	4	1630	June 18, 2019
APM server not connecting to ElasticSearch APM	3	1883	March 8, 2019
1. Apm server is not creating index in ElasticSearch APM server	6	1452	September 16, 2019
Failed to connect to backoff(elasticsearch(http://es01:9200)): Connection marked as failed because the onConnect callback failed: resource 'apm-7.5.2-error' exists, but it is not an alias APM	5	7488	June 30, 2020