[[mapping-ignored-field]] === `_ignored` field added[6.4.0] The `_ignored` field indexes and stores the names of every field in a document that has been ignored because it was malformed and <<ignore-malformed,`ignore_malformed`>> was turned on. This field is searchable with <<query-dsl-term-query,`term`>>, <<query-dsl-terms-query,`terms`>> and <<query-dsl-exists-query,`exists`>> queries, and is returned as part of the search hits. For instance the below query matches all documents that have one or more fields that got ignored: [source,js] -------------------------------------------------- GET _search { "query": { "exists": { "field": "_ignored" } } } -------------------------------------------------- // CONSOLE Similarly, the below query finds all documents whose `@timestamp` field was ignored at index time: [source,js] -------------------------------------------------- GET _search { "query": { "term": { "_ignored": "@timestamp" } } } -------------------------------------------------- // CONSOLE