Please be advised, an issue has been identified with Opensearch V2.16.
Search queries in Opensearch generated from Alerting do not provide proper expected results. Graylog recommends only upgrading Opensearch to the supported release stated in the documentation, which can be found here. It is also recommended to pin your Opensearch release to the current supported version.
The details of the issue are identified here.
Graylog V6.0 can be installed and supported with Opensearch V2.15.
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