[FTS] Inconsistency in search results when number of index partitions are updated with "and" knn_operator

Steps to repro

1. Created a 4 node cluster with 2 search nodes, 1 kv node, 1 query node
2. Created a couchbase bucket
3. Loaded some documents onto the bucket
4. Created a search index with with 2 mapping child fields
   1. field - content, type - text, searchable as - content, analyser - en
   2. field - vector, type - vector, searchable as - vector, dimension - 384, similarity metric - dot_product
5. Ran a search query on the index, got a single document
6. Changed the Index Partitions from 1 to 3
7. Ran the search query on the index and the number of documents are different

The query result when number of index partitions is 1

The query results when number of index partitions is 3

The search query for the above example - https://cb-engineering.s3.amazonaws.com/MB-60079/search_query.json

The logs for this run
https://cb-engineering.s3.amazonaws.com/MB-60079/collectinfo-2023-12-11T140252-ns_1%40ec2-34-207-248-199.compute-1.amazonaws.com.zip
https://cb-engineering.s3.amazonaws.com/MB-60079/collectinfo-2023-12-11T140252-ns_1%40ec2-34-228-213-122.compute-1.amazonaws.com.zip
https://cb-engineering.s3.amazonaws.com/MB-60079/collectinfo-2023-12-11T140252-ns_1%40ec2-54-161-32-120.compute-1.amazonaws.com.zip
https://cb-engineering.s3.amazonaws.com/MB-60079/collectinfo-2023-12-11T140252-ns_1%40ec2-54-91-76-87.compute-1.amazonaws.com.zip