@FunctionalInterface public static interface IndexWriter.IndexReaderWarmer
been called (ie, this writer is in near real-time
mode), then after a merge completes, this class can be
invoked to warm the reader on the newly merged
segment, before the merge commits. This is not
required for near real-time search, but will reduce
search latency on opening a new near real-time reader
after a merge completes.
warm(LeafReader) is called before any
deletes have been carried over to the merged segment.
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