sgup432 opened a new issue, #12597:
URL: https://github.com/apache/lucene/issues/12597
### Description
As of now, lucene LRU query cache and other OpenSearch caches uses CacheKey
as a primary key for their caches as it helps to determine any changes during
segment merges etc. We use IdentityHashMap and object equality for the
comparison.
I was looking for some ways to serialize this CacheKey and store cache data
on disk etc. But seems like I can't do it. I can't really extend it as it is
declared as final, doesn't implement Serializable, or even after
serialization/deserialization process the actual object will change making it
useless in the end.
I was thinking for simplicity sake whether we could assign some unique id to
this class during initialization which can be used instead of the object itself.
Something like
```
public static final class CacheKey {
private final UUID uniqueId;
CacheKey() {
uniqueId = UUID.randomUUID();
}
public String getUniqueId() {
return uniqueId.toString();
}
}
````
Let me know what you folks think as this seems like a harmless change.
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