Marks terms as keywords. This token filter is implemented using Apache Lucene.
A value indicating whether to ignore case. If true, all words are converted to lower case first. Default is false. Default value: false.
A list of words to mark as keywords.
The name of the token filter. It must only contain letters, digits, spaces, dashes or underscores, can only start and end with alphanumeric characters, and is limited to 128 characters.
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