HnswGraphProvider (Lucene 9.10.0 core API)

All Known Implementing Classes:

Lucene99HnswVectorsReader
```
public interface HnswGraphProvider
```
An interface that provides an HNSW graph. This interface is useful when gathering multiple HNSW graphs to bootstrap segment merging. The graph may be off the JVM heap.

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

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  HnswGraph getGraph(String field)
  Return the stored HnswGraph for the given field.

- Method Detail
  - getGraph
```
HnswGraph getGraph(String field)
            throws IOException
```
    Return the stored HnswGraph for the given field.
    
    Parameters:
    
    field - the field containing the graph
    
    Returns:
    
    the HnswGraph for the given field if found
    
    Throws:
    
    IOException - when reading potentially off-heap graph fails