Class SearcherFactory

Factory class used by SearcherManager to create new IndexSearchers. The default implementation just creates an IndexSearcher with no custom behavior:

    public IndexSearcher NewSearcher(IndexReader r)
    {
        return new IndexSearcher(r);
    }

You can pass your own factory instead if you want custom behavior, such as:

• Setting a custom scoring model: Similarity
• Parallel per-segment search:
• 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 set MergedSegmentWarmer to warm newly merged segments in the background, outside of the reopen path.