This setting is used only when using the allocation action
action: allocation description: "Apply shard allocation filtering rules to the specified indices" options: key: ... value: ... allocation_type: ... filters: - filtertype: ...
The value of this setting must be one of
Read more about these settings at http://www.elastic.co/guide/en/elasticsearch/reference/7.0/shard-allocation-filtering.html
The default value for this setting is