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Troubleshooting Elasticsearch cluster non nominal Nagios status

Why do that

Nagios reports a Yellow or Red status on an Elasticsearch cluster

What to do

Use the PunchPlatform Admin GUI :

: - To know the concerned ES cluster(s) - To know if it means:

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    > -   Under-replication (Yellow status of « online cluster »,
    >     and some of the indexes within)
    > -   Some Data unavailability (RED status of « online cluster »
    >     provided by elasticsearch). The indexes are listed in the
    >     HMI, and at least some are in RED health.
    > -   Cluster unavailability (RED status of «online cluster »
    >     but service says « unable to determine cluster status »
    > -   Housekeeping problem (Yellow status of « housekeeping »
    >     for some indexes)

Then refer to the applicable troubleshooting document depending on the identified case.