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Metadata filters are specified in the <metadataFilters/> element in tika-config.xml. They are run in order, and order matters.
See TikaServerEndpointsCompared for which endpoints apply metadataFilters in tika-server. They Metadata filters are applied in tika-pipes and tika-app when using the -J option. MetadataFilters are not applied when Tika streams output.
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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