Elastic Search indices locked after disk space issues

When using Elastic Search 6.0 and greater, the indices will become locked in circumstances where disk space used is in excess of 90% in the locating where Elastic Search is installed.

In these situations, analytics will not function due to the indices being read only.

After clearing space on your machine, the following command will need to be executed to make indices writable again:

'''curl -XPUT -H 'content-type: application/json' <es_fqdn>:9200/*/_settings -d '{"index.blocks.read_only_allow_delete": null}'''

<es_fdqn> = the fully qualified machine name where elastic search is installed in a single node install or any node in an environment where there are more than 1 elastic search node.

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