LUCENE-8933: Validate JapaneseTokenizer user dictionary entry (for 8.x) #810
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Description
This adds a format check to Kuromoji user dictionary if the concatenated segment is not longer than its surface form. (For backwards compatibility, we check only segmentation length in 8.x and will add more strict equality check as of 9.0.) See https://issues.apache.org/jira/browse/LUCENE-8933