APM Server returns interleaved 503 and 202 responses on ES Cluster

I have setup Elastic APM which sends data to Elasticsearch.
When I setup Elasticsearch with single instance, Elastic APM server working fine responding 202 response.
When I setup Elasticsearch cluster(3 master, 3 data nodes, 2 ingest, 2 coordinate nodes) , APM server server misbehaves responding interleaved 202 and 503
Using coordinate host in Elastic APM
This link https://www.elastic.co/guide/en/apm/server/master/common-problems.html#queue-full has some info but I am unable to resolve issue.

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