IndexWriter.IndexReaderWarmer (Lucene 8.5.1 API)

All Known Implementing Classes:

SimpleMergedSegmentWarmer

Enclosing class:

IndexWriter

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public static interface IndexWriter.IndexReaderWarmer
```
If DirectoryReader.open(IndexWriter) has 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.

WARNING: This API is experimental and might change in incompatible ways in the next release.

NOTE: warm(LeafReader) is called before any deletes have been carried over to the merged segment.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`warm(LeafReader reader)`	Invoked on the `LeafReader` for the newly merged segment, before that segment is made visible to near-real-time readers.

- Method Detail
  - warm
```
void warm(LeafReader reader)
   throws IOException
```
    Invoked on the LeafReader for the newly merged segment, before that segment is made visible to near-real-time readers.
    
    Throws:
    
    IOException