It is possible to define a metadata key to index as follows:
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Locate the line of the metadata key to index.
Users can type a metadata key's name in the search box above the table to filter metadata keys.
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Select the Index values check box on to index the key's values.
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Select Save and reprocess to apply the new configuration.
Once the content is reprocessed, users can perform search queries using the name of the metadata value as a keyword.