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  1. Couchbase Server
  2. MB-60081

[FTS] : Inconsistencies in score explanation in vector search

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Details

    • Bug
    • Resolution: Fixed
    • Major
    • 7.6.0
    • 7.6.0
    • fts
    • Couchbase Enterprise Edition 7.6.0-1916

    Description

      Steps to repro

      1. Created a 4 node cluster with 2 fts node, 1 kv and 1 query
      2. Created a couchstore bucket and loaded some docs
      3. 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
      4. Ran a search query on the index with "explain": true
      5. The search query returns inconsistent scoring explanation

      The first 3 docs returned have consistent results and correct score explanations

      The remaining docs have all inconsistent results{}

       

      First 3 docs

       

      1st result doc 17 correct explanation

      2nd result doc 24 correct explanation

      3rd result doc 21 correct explanation{}

       

      The remaining docs have all incorrect score explanations and inconsistent results

       

       

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            raghav.sk Raghav S K
            raghav.sk Raghav S K
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            Dates

              Created:
              Updated:
              Resolved:

              PagerDuty