benwtrent opened a new issue, #12219:
URL: https://github.com/apache/lucene/issues/12219
### Description
There are two major reasons for adding a custom vector similarity function:
- Adding new nuanced similarity functions (jaccard, hamming, etc.)
- Have external support for unstable JVM APIs (Vector incubator)
I am not 100% sure Lucene itself should go through the work of consistently
adding new similarity functions.
We should make these pluggable in such a way that developers using Lucene
can provide specialized distance functions.
I think the main issue is that the Vector Similarity function is tied to the
FieldType and currently that is not pluggable via any external configuration.
There are two ways I can think of for doing this:
- The functions being provided in indexing and search configurations (not a
fan of this option).
- Using an SPI (seems like a more natural option).
Opening this issue for discussion.
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