Add common causes for unassigned shards #796
Merged
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Relates to elastic/elasticsearch#124798
.. in particular elastic/elasticsearch#124798 (comment)
This PR adds new sections to the Unassigned shards troubleshooting page based on content derived from https://www.elastic.co/guide/en/elasticsearch/reference/8.18/cluster-allocation-explain.html#cluster-allocation-explain-api-examples. Two of those sections are linked from the Elasticsearch logs, so I've added custom anchors for increased link permanency
We can continue to copy in additional examples in subsequent PRs if we need to close this quickly for linking purposes.