benwtrent commented on issue #12570:
URL: https://github.com/apache/lucene/issues/12570#issuecomment-1724413959
OK, debugging some more, looks like merging multiple segments and then force
merging with Lucene Util 100% replicates this in 9.6.
The connection count on force merge increases from the configured 32 to 192.
We need to limit the diverse connections and backwards connections I am
guessing.
To protect users in the medium term, something like
```java
if (arcCount > currentNeighborsBuffer.length) {
currentNeighborsBuffer = ArrayUtil.grow(currentNeighborsBuffer, arcCount);
}
```
should be added for Lucene95 codec vector reader.
But we are expanding connections to a fairly obscene amount. Jumping from an
initial connection configuration of 32 to a whopping 192 is crazy!
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