ES|QL Reranker command

[afoucret]

Implementation of the RERANK command

Command syntax

| RERANK "query text" ON title,description WITH `reranker-inference-id`

where

• query text is a constant string (can use a param instead ?queryText)
• ON clause contains one or several field separated by comma
  • it is also possible to rename a field here (eg ON title, description=overview)
  • it is also possible to create computed fields here (eg ON title, short_description=SUBSTRING(description,0 100))
• WITH the name of inference endpoint to be used for reranking. The inference endpoint task type has to be rerank

Done:

• Grammar and parsing of the command
• Logical plan
• Pre-analysis and Analysis
  • Detect missing inference endpoint
  • Ensure all expression are resolved
• Logical plan optimization
  • Default limits and sort order for the rerank command
• Physical plan and planing
• Reranker async operator

Follow-up:

• Follow-up tasks are listed in the RERANK meta issue

[jimczi]

LGTM