[jira] [Created] (LUCENE-6880) Add document oriented collector for NRTSuggester

["Areek Zillur (JIRA)" <ji...@apache.org>]

Areek Zillur created LUCENE-6880:
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             Summary: Add document oriented collector for NRTSuggester
                 Key: LUCENE-6880
                 URL: https://issues.apache.org/jira/browse/LUCENE-6880
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Areek Zillur
            Assignee: Areek Zillur
             Fix For: Trunk, 5.4


Currently NRTSuggester collects completions iteratively as they are accepted by the TopNSearcher, implying that a document can be collected more than once. In case of indexing a completion with multiple context values, the completion leads to {{num_context}} paths in the underlying FST for the same docId and gets collected {{num_context}} times, when a query matches all its contexts. 

Ideally, a document-oriented collector will collect top N documents instead of top N completions by handling the docId deduplication while collecting the completions. This could be used to collect n unique documents that matched a completion query. 



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