[8.18] Rare terms aggregation false **positive** fix (#126884) #127357
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I found that `rare_terms` aggregation can return **false positive**
results (some of the returned results are not real). I traced it
down and find out it's a bug in `CuckooFilter`'s merge methord.
```
if (isSetMode == false && other.isSetMode) {
other.hashes.forEach(this::add);
}
```
should be
```
if (isSetMode == false && other.isSetMode) {
other.hashes.forEach(this::addHash);
}
```
nik9000
added
:Analytics/Aggregations
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Backports the following commits to 8.18: