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_field_names
edit
IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.
_field_names
editThe _field_names field indexes the field names of a document, which can later
be used to search for documents based on the fields that they contain typically
using the exists and missing filters.
_field_names is indexed by default for indices that have been created after
Elasticsearch 1.3.0.
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