David Smiley created LUCENE-8332:
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             Summary: New ConcatenateGraphTokenStream (move/rename 
CompletionTokenStream)
                 Key: LUCENE-8332
                 URL: https://issues.apache.org/jira/browse/LUCENE-8332
             Project: Lucene - Core
          Issue Type: New Feature
          Components: modules/analysis
            Reporter: David Smiley
            Assignee: David Smiley


Lets move and rename the CompletionTokenStream in the suggest module into the 
analysis module renamed as ConcatenateGraphTokenStream. See comments in 
LUCENE-8323 leading to this idea. Such a TokenStream (or TokenFilter?) has 
several uses:
 * for the suggest module
 * by the SolrTextTagger for NER/ERD use cases – SOLR-12376
 * for doing complete match search efficiently

It will need a factory – a TokenFilterFactory, even though we don't have a 
TokenFilter based subclass of TokenStream.

It appears there is no back-compat concern in it suddenly disappearing from the 
suggest module as it's marked experimental and it only seems to be public now 
perhaps due to some technicality (it has package level constructors).



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