Upgraded to 7.2 "Kibana server is not ready yet"

I'm working in Ubuntu 18.04 and upgraded ELK stack to 7.2. All services are running
(Elasticsearch, Logstash , Kibana and Filebeat), but Kibana displays "Kibana server is not ready yet"

and the kibana status shows:

Jun 28 15:54:39 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:54:39Z","tags":["error","task_manager"],"pid":1099,"message":"Failed to poll for work: [search_phase_execution_exception] all shards failed :: {"path":"/.kibana_task_manager/_search","query":{"ignore_unavailable":true},"body":"{\"query\":{\"bool\":{\"must\":[{\"term\":{\"type\":\"task\"}},{\"b
Jun 28 15:54:42 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:54:42Z","tags":["error","task_manager"],"pid":1099,"message":"Failed to poll for work: [search_phase_execution_exception] all shards failed :: {"path":"/.kibana_task_manager/_search","query":{"ignore_unavailable":true},"body":"{\"query\":{\"bool\":{\"must\":[{\"term\":{\"type\":\"task\"}},{\"b
Jun 28 15:54:44 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:54:44Z","tags":["info","migrations"],"pid":1099,"message":"Creating index .kibana_2."}
Jun 28 15:54:44 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:54:44Z","tags":["warning","migrations"],"pid":1099,"message":"Another Kibana instance appears to be migrating the index. Waiting for that migration to complete. If no other Kibana instance is attempting migrations, you can get past this message by deleting index .kibana_2 and restarting Kibana."}
Jun 28 15:55:45 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:55:45Z","tags":["warning","task_manager"],"pid":1099,"message":"The task maps_telemetry "Maps-maps_telemetry" is not cancellable."}
Jun 28 15:56:49 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:56:49Z","tags":["warning","task_manager"],"pid":1099,"message":"The task maps_telemetry "Maps-maps_telemetry" is not cancellable."}
Jun 28 15:57:49 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:57:49Z","tags":["warning","task_manager"],"pid":1099,"message":"The task maps_telemetry "Maps-maps_telemetry" is not cancellable."}
Jun 28 15:58:49 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:58:49Z","tags":["warning","task_manager"],"pid":1099,"message":"The task maps_telemetry "Maps-maps_telemetry" is not cancellable."}
Jun 28 15:59:49 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T14:59:49Z","tags":["warning","task_manager"],"pid":1099,"message":"The task maps_telemetry "Maps-maps_telemetry" is not cancellable."}
Jun 28 16:00:50 SCL-SIEM-01 kibana[1099]: {"type":"log","@timestamp":"2019-06-28T15:00:50Z","tags":["warning","task_manager"],"pid":1099,"message":"The task maps_telemetry "Maps-maps_telemetry" is not cancellable."}

Any Thoughts?

From which version did you upgrade from ?

sorry for the late reply

we upgraded from Kibana 6.8 I believe and elasticsearch was 7

Look like i've fix the problem

I deleted one of the kibana index

using

curl -XDELETE 'http://localhost:9200/.kibana_1' --header "content-type: application/JSON" -u elastic -p

based off this:

Glad it worked..thanks for posting your solution.

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