Status changed from yellow to red - Elasticsearch plugin is red

Hi,

I tried to upgrade elasticsearch from 2.2 to 5.6. The indices are showing yellow state. the index .kibana is also showing yellow state. IWhile i was using 2.4 elasticsearch, I was using 4.4 Kibana version. After upgrading elasticsearch from 2.2 to 5.6, i removed the existing verion of 4.4 kibana and gave a fresh installation through rpm for kibana 5.6. But i am getting " Status changed from yellow to red - Elasticsearch plugin is red" error in kibana log file. Can some one please help me with this issue?

curl -XGET '172.31.20.37:9200/_cat/indices?v&pretty'
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open test AMB7egueQMq55a-tU6CHjw 5 1 0 0 955b 955b
yellow open mobiquity-logs-2018.09.04.09 UL3KQKqvSXihpB8GhdSMMw 5 1 4 0 33.6kb 33.6kb
yellow open .kibana fpEth_zMSYGMziwuArZxGg 1 1 1 0 3.2kb 3.2kb

Kibana log file

{"type":"log","@timestamp":"2018-09-05T05:32:16Z","tags":["status","plugin:timelion@5.6.0","info"],"pid":1798,"state":"green","message":"Status changed from uninitialized to green - Ready","prevState":"uninitialized","prevMsg":"uninitialized"}
{"type":"log","@timestamp":"2018-09-05T05:32:16Z","tags":["listening","info"],"pid":1798,"message":"Server running at http://0.0.0.0:5601"}
{"type":"log","@timestamp":"2018-09-05T05:32:16Z","tags":["status","ui settings","info"],"pid":1798,"state":"yellow","message":"Status changed from uninitialized to yellow - Elasticsearch plugin is yellow","prevState":"uninitialized","prevMsg":"uninitialized"}
{"type":"log","@timestamp":"2018-09-05T05:32:17Z","tags":["status","plugin:elasticsearch@5.6.0","error"],"pid":1798,"state":"red","message":"Status changed from yellow to red - all shards failed: [unsupported_operation_exception] null","prevState":"yellow","prevMsg":"Waiting for Elasticsearch"}
{"type":"log","@timestamp":"2018-09-05T05:32:17Z","tags":["status","ui settings","error"],"pid":1798,"state":"red","message":"Status changed from yellow to red - Elasticsearch plugin is red","prevState":"yellow","prevMsg":"Elasticsearch plugin is yellow"}

Where any of your indices created in Elasticsearch 1.x? if so, those need to be re-index in 2.4 first - https://www.elastic.co/guide/en/elasticsearch/reference/5.6/reindex-upgrade.html

Can you check your elasticsearch logs? Look for warnings that might help explain why the indices are yellow.

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