we have lots of indexes. some have "_type" : "logs" & some have "_type" : "log event" . It pushes logs every month after creating an index with the required _type. but suddenly it was stopped pushing logs to customized _type and starts push logs using "_type":"_doc" .
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You shouldn't be using custom _types like that as types are disappearing in 8.0. Please move those to a different field and then use the default _doc.
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