MB-62182: Interface for fetching the centroid index (#72)

Co-authored-by: Abhinav Dangeti <abhinav@couchbase.com>

Author: Thejas-bhat

go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/RoaringBitmap/roaring/v2 v2.14.5
-	github.com/blevesearch/bleve_index_api v1.3.4
+	github.com/blevesearch/bleve_index_api v1.3.5
 )
 
 require (

go.sum

@@ -2,8 +2,8 @@ github.com/RoaringBitmap/roaring/v2 v2.14.5 h1:ckd0o545JqDPeVJDgeFoaM21eBixUnlWf
 github.com/RoaringBitmap/roaring/v2 v2.14.5/go.mod h1:eq4wdNXxtJIS/oikeCzdX1rBzek7ANzbth041hrU8Q4=
 github.com/bits-and-blooms/bitset v1.24.2 h1:M7/NzVbsytmtfHbumG+K2bremQPMJuqv1JD3vOaFxp0=
 github.com/bits-and-blooms/bitset v1.24.2/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
-github.com/blevesearch/bleve_index_api v1.3.4 h1:hZezxSRGFX4+/wiEn/a9xxBIo4BAJvqVfmZYoVzmjas=
-github.com/blevesearch/bleve_index_api v1.3.4/go.mod h1:xvd48t5XMeeioWQ5/jZvgLrV98flT2rdvEJ3l/ki4Ko=
+github.com/blevesearch/bleve_index_api v1.3.5 h1:Sbfavf0iBRoiYLM5lKCPIrSSYeQXReoRmk53pZnTKYk=
+github.com/blevesearch/bleve_index_api v1.3.5/go.mod h1:xvd48t5XMeeioWQ5/jZvgLrV98flT2rdvEJ3l/ki4Ko=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/mschoch/smat v0.2.0 h1:8imxQsjDm8yFEAVBe7azKmKSgzSkZXDuKkSq9374khM=

segment_vector.go

@@ -76,6 +76,11 @@ type VectorIndex interface {
 	ObtainKCentroidCardinalitiesFromIVFIndex(limit int, descending bool) ([]index.CentroidCardinality, error)
 }
 
+type TrainedSegment interface {
+	Segment
+	GetCoarseQuantizer(field string) (interface{}, error)
+}
+
 type VectorSegment interface {
 	Segment
 	InterpretVectorIndex(field string, except *roaring.Bitmap) (VectorIndex, error)