A token filter that only keeps tokens with text contained in a specified list of words. This token filter is implemented using Apache Lucene.
The list of words to keep.
A value indicating whether to lower case all words first. Default is false. Default value: false.
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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