Opensearch 1.0.0 incompatible with kibana 7.10.2

[antonisnyc94]

Describe the bug
Out of nowhere when I restarted my kibana instance, I get the message that the elasticsearch version is incompatible... even tho I clearly clicked on compatibility with 7.10.2 when upgrading Amazon elasticsearch

{"type":"log","@timestamp":"2021-09-23T17:04:31Z","tags":["info","savedobjects-service"],"pid":16,"message":"Waiting until all Elasticsearch nodes are compatible with Kibana before starting saved objects migrations..."}
{"type":"log","@timestamp":"2021-09-23T17:04:31Z","tags":["error","savedobjects-service"],"pid":16,"message":"This version of Kibana (v7.10.2) is incompatible with the following Elasticsearch nodes in your cluster: v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined), v1.0.0 @ undefined (undefined)"}

To Reproduce
external kibana pod authenticated with basic auth to opensearch cluster in AWS

[CEHENKLE]

Transferring to Dashboards. As you guys are looking at BWC, let's make sure we capture this case.

[kavilla]

OpenSearch Dashboards 1.x is compatible with ElasticSearch 7.10.2 and OpenSearch. But this is dealing with Kibana 7.x which we don't own.

@antonisnyc94, I would recommended one of following. Migrate Kibana to OpenSearch Dashboards, or reaching out your Amazon support.

The code to check happens in Kibana, to which this repo would not touch. Potentially the OpenSearch repo can hack it to make fake it's version when Kibana calls it but I can see that given a huge amount of risk. So if you don't want to migrate it will have to be the service's decision to support it.

But will close this issue as there is not much we can do in this repo for this use case.

[dblock]

@antonisnyc94 What version does curl server:9200 report for your OpenSearch instance? It should be 7.10.2 in compatibility mode and I wouldn't expect Kibana to complain that it's talking to version 1.0.0.