tteofili commented on issue #14214:
URL: https://github.com/apache/lucene/issues/14214#issuecomment-2642779168
this can be reproduced with either of the following tests
```java
public void testSameVectorIndexedMultipleTimes() throws IOException {
try (Directory d = newDirectory()) {
try (IndexWriter w = new IndexWriter(d, new IndexWriterConfig())) {
for (int j = 1; j <= 1_000_000; j++) {
Document doc = new Document();
doc.add(
getKnnVectorField(
"field", randomVector(16), DOT_PRODUCT));
w.addDocument(doc);
if (j % 100 == 0) {
w.flush();
}
}
w.commit();
}
}
}
public void testFewDistinctVectors() throws IOException {
try (Directory d = newDirectory()) {
try (IndexWriter w = new IndexWriter(d, new IndexWriterConfig())) {
float[][] f = new float[16][];
for (int i = 0; i < 16; i++) {
f[i] = new float[16];
Arrays.fill(f[i], (float) i);
}
for (int i =0; i < 1_000_000; i++) {
Document doc = new Document();
doc.add(getKnnVectorField("field", f[random().nextInt(16)],
DOT_PRODUCT));
w.addDocument(doc);
}
}
}
}
```
they take tens of minutes and thread dump shows thread stuck at
`hnsw.HnswGraphBuilder.connectComponents`
whereas a similar test even with random vectors takes 10x less time to
finish.
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