Examples of org.apache.lucene.search.SearcherFactory

org.apache.lucene.search.SearcherFactory
Factory class used by {@link SearcherManager} and {@link NRTManager} tocreate new IndexSearchers. The default implementation just creates an IndexSearcher with no custom behavior:
```
 public IndexSearcher newSearcher(IndexReader r) throws IOException { return new IndexSearcher(r); } 
```
You can pass your own factory instead if you want custom behavior, such as:
- Setting a custom scoring model: {@link IndexSearcher#setSimilarity(Similarity)}
- Parallel per-segment search: {@link IndexSearcher#IndexSearcher(IndexReader,ExecutorService)}
- Return custom subclasses of IndexSearcher (for example that implement distributed scoring)
- Run queries to warm your IndexSearcher before it is used. Note: when using near-realtime search you may want to also {@link IndexWriterConfig#setMergedSegmentWarmer(IndexWriter.IndexReaderWarmer)} to warmnewly merged segments in the background, outside of the reopen path.
@lucene.experimental

    
    for(String collectionName : collectionNames) {
      
      logger.info("collection name {}", collectionName);
      
      SearcherFactory searcherFactory = new SearcherFactory();
      IndexWriter indexWriter = indexWriterManager.getIndexWriter(collectionName);
      SearcherManager searcherManager = null;
      
      try {

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   * uses can tolerate seeing some deleted docs, since
   * reopen time is faster if deletes need not be applied. */
  public NRTManager(TrackingIndexWriter writer, SearcherFactory searcherFactory, boolean applyAllDeletes) throws IOException {
    this.writer = writer;
    if (searcherFactory == null) {
      searcherFactory = new SearcherFactory();
    }
    this.searcherFactory = searcherFactory;
    current = SearcherManager.getSearcher(searcherFactory, IndexReader.open(writer.getIndexWriter(), applyAllDeletes));
  }

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    private final FullTextIndexShared index;
    private final SearcherManager searcherManager;


    public Searcher(FullTextIndexShared index, Analyzer analyzer) throws IOException {
        this.index = index;
        this.searcherManager = new SearcherManager(index.open(), new SearcherFactory());
    }

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            // The index needs to exist before creating the searcher manager so do a quick commit
            // of nothing in case the index doesn't exist already.
            this.indexWriter.commit();
        }


        this.searcherManager = new SearcherManager(FSDirectory.open(indexDir), new SearcherFactory());
  }

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