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Metadata filters are specified in the <metadataFilters/> element in tika-config.xml.  They are run in order, and order will mattermatters.

See TikaServerEndpointsCompared for which endpoints apply metadataFilters in tika-server.  They are applied in tika-pipes and tika-app when using the -J option.

FieldNameMappingFilter

This is used to select fields to include and to rename fields from the Tika names to preferred names.  This was initially designed for modifying field names before emitting document to OpenSearch or Solr.

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