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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