[FEATURE] New Query for Normalization and Score Combination Query

[martin-gaievski]

Description

For Normalization and Score Combination feature, we need a new Query clause that holds multiple sub-queries of different types. The query will be executed in a _search API call.

Solution

Solution that is proposed here is to create new implementation of a QueryBuilder and Query. Those classes mainly will be responsible for parsing new query clause and creating instances of corresponding sub-query types.

Because special logic is required for scores we also need a new implementation of Scorer. New scorer will accumulate scores from multiple sub-queries.

Tasks

• Create RFC for new Query Clause: [RFC] Low Level Design for Normalization and Score Combination Query #174
• Implementation of a Query clause
• Testing

Reference Links

1. [RFC] High Level Approach and Design For Normalization and Score Combination #126
2. [RFC] Low Level Design for Normalization and Score Combination Query #174

[navneet1v]

Resolving this github issue as the changes for RC of 2.10 is finalized and merged. Please create a github issue if there are any further questions.