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Provide explanation of dangling indices, fixes #26008 (#26999)

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* Provide explanation of dangling indices, fixes #26008

Adjusted from PR review comments

* updates to suggested wording and minor typo fix.
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Peter Dyson 2018-01-22 18:39:21 +10:00 committed by GitHub
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@ -48,3 +48,12 @@ as long as the following conditions are met:
Recover as long as this many data nodes have joined the cluster. Recover as long as this many data nodes have joined the cluster.
NOTE: These settings only take effect on a full cluster restart. NOTE: These settings only take effect on a full cluster restart.
=== Dangling indices
When a node joins the cluster, any shards stored in its local data directory
directory which do not already exist in the cluster will be imported into the
cluster. This functionality is intended as a best effort to help users who
lose all master nodes. If a new master node is started which is unaware of
the other indices in the cluster, adding the old nodes will cause the old
indices to be imported, instead of being deleted.