Details
Major Description
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.