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https://issues.apache.org/jira/browse/LUCENE-6339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14347725#comment-14347725
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Areek Zillur edited comment on LUCENE-6339 at 3/4/15 10:56 PM:
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Initial patch. needs more unit tests.
The custom postings format was originally a fork of
[Completion090PostingsFormat |
https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/search/suggest/completion/Completion090PostingsFormat.java].
Document suggestion uses the same TopNSearcher as that of AnalyzingSuggester.
Would be awesome to get some feedback on the patch!
was (Author: areek):
Initial patch. needs more unit tests.
The custom postings format was originally a fork of
[https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/search/suggest/completion/Completion090PostingsFormat.java].
Document suggestion uses the same TopNSearcher as that of AnalyzingSuggester.
Would be awesome to get some feedback on the patch!
> [suggest] Near real time Document Suggester
> -------------------------------------------
>
> Key: LUCENE-6339
> URL: https://issues.apache.org/jira/browse/LUCENE-6339
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/search
> Affects Versions: 5.0
> Reporter: Areek Zillur
> Assignee: Areek Zillur
> Fix For: 5.0
>
> Attachments: LUCENE-6339.patch
>
>
> The idea is to index documents with one or more *SuggestField*(s) and be able
> to suggest documents with a *SuggestField* value that matches a given key.
> Individual *SuggestField* can be assigned a numeric weight to be used to
> score the suggestion at query time.
> Document suggestion can be done on an indexed *SuggestField*. The document
> suggester can filter out deleted documents in near real-time. The suggester
> can filter out documents based on a Filter (note: may change to a non-scoring
> query?) at query time.
> A custom postings format (CompletionPostingsFormat) is used to index
> *SuggestField*s and perform document suggestions.
> h4. Usage
> {code:java}
> // hook up custom postings format
> // indexAnalyzer for SuggestField
> Analyzer analyzer = ...
> IndexWriterConfig config = new IndexWriterConfig(analyzer);
> Codec codec = new Lucene50Codec() {
> @Override
> public PostingsFormat getPostingsFormatForField(String field) {
> if (isSuggestField(field)) {
> return new
> CompletionPostingsFormat(super.getPostingsFormatForField(field));
> }
> return super.getPostingsFormatForField(field);
> }
> };
> config.setCodec(codec);
> IndexWriter writer = new IndexWriter(dir, config);
> // index some documents with suggestions
> Document doc = new Document();
> doc.add(new SuggestField("suggest_title", "title1", 2));
> doc.add(new SuggestField("suggest_name", "name1", 3));
> writer.addDocument(document)
> ...
> // open an nrt reader for the directory
> DirectoryReader reader = DirectoryReader.open(writer, false);
> // SuggestIndexSearcher is a thin wrapper over IndexSearcher
> // queryAnalyzer will be used to analyze the query string
> SuggestIndexSearcher indexSearcher = new SuggestIndexSearcher(reader,
> queryAnalyzer);
>
> // suggest 10 documents for "titl" on "suggest_title" field
> TopSuggestDocs suggest = indexSearcher.suggest("suggest_title", "titl", 10);
> {code}
> h4. Indexing
> Index analyzer set through *IndexWriterConfig*
> {code:java}
> new SuggestField(name, suggestion, weight)
> {code}
> h4. Query
> Query analyzer set through *SuggestIndexSearcher*
> {code:java}
> // full options for TopSuggestDocs (TopDocs)
> TopSuggestDocs suggest = suggestIndexSearcher.suggest(String field,
> CharSequence key, int num, Filter filter)
> // full options for Collector
> // note: only collects does not score
> suggestIndexSearcher.suggest(String field, CharSequence key, int
> maxNumPerLeaf, Filter filter, Collector collector)
> {code}
> h4. Analyzer
> *CompletionAnalyzer* can be used instead to wrap another analyzer to tune
> suggest field only parameters.
> {code:java}
> CompletionAnalyzer completionAnalyzer = new CompletionAnalyzer(analyzer);
> completionAnalyzer.setPreserveSep(..)
> completionAnalyzer.setPreservePositionsIncrements(..)
> completionAnalyzer.setMaxGraphExpansions(..)
> {code}
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