[Multi Match] Refactor QueryIntercepter Rewrite

[Samiul-TheSoccerFan]

This PR is the first part of multi_match implementation with semantic_text field.

This PR includes:

• Update getFieldName to handle fieldName along with its per field boost.
• supply field boost value into each intercepter.
• Update intercepter framework to handle the updated function name.

PUT my_documents
{
  "mappings": {
    "properties": {
      "title": {
        "type": "text"
      },
      "content": {
        "type": "text"
      }
    }
  }
}

PUT my_documents/_doc/1
{ 
  "title": "Introduction to Machine Learning",
  "content": "This guide covers supervised and unsupervised learning." 
}

PUT my_documents/_doc/2
{ 
  "title": "Solar Panels for Beginners",
  "content": "Learn how solar energy works and its benefits."
}

POST my_documents/_search --works as expected
{
  "query": {
    "multi_match": {
      "query": "learn solar energy",
      "fields": ["title", "content^2"],
      "boost": 3.0
    }
  }
}


PUT my_semantic_documents
{
  "mappings": {
    "properties": {
      "title": {
        "type": "semantic_text"
      }
    }
  }
}

PUT my_semantic_documents/_doc/1
{ 
  "title": "Introduction to Machine Learning"
}

PUT my_semantic_documents/_doc/2
{ 
  "title": "Solar Panels for Beginners"
}

POST my_semantic_documents/_search -- fails as expected
{
  "query": {
    "multi_match": {
      "query": "learn solar energy",
      "fields": [
        "title^2"
      ],
      "boost": 3.0,
      "_name": "semantic_query"
    }
  }
}

PUT my_another_semantic_documents
{
  "mappings": {
    "properties": {
      "title": {
        "type": "text"
      },
      "content": {
        "type": "semantic_text"
      }
    }
  }
}

PUT my_another_semantic_documents/_doc/1
{ 
  "title": "Introduction to Machine Learning",
  "content": "This guide covers supervised and unsupervised learning." 
}

PUT my_another_semantic_documents/_doc/2
{ 
  "title": "Solar Panels for Beginners",
  "content": "Learn how solar energy works and its benefits."
}

POST my_another_semantic_documents/_search -- fails as expected
{
  "query": {
    "multi_match": {
      "query": "learn solar energy",
      "fields": [
        "title",
        "content"
      ]
    }
  }
}

[elasticsearchmachine]

Pinging @elastic/search-eng (Team:SearchOrg)

[elasticsearchmachine]

Pinging @elastic/search-relevance (Team:Search - Relevance)

[elasticsearchmachine]

Hi @Samiul-TheSoccerFan, I've created a changelog YAML for you.

[Mikep86]

We don't need a changelog for this PR. Let's label it as >refactor to remove that.

[Mikep86]

The changes to this method are not effectively preparing for the changes that will actually necessary to support multi_match here. I suggest taking some time to think about how you will change this method to properly support multi_match, making an implementation plan, and then determining which parts of that plan can and should be done as part of this initial refactor PR.

[Samiul-TheSoccerFan]

@elasticmachine update branch

[Samiul-TheSoccerFan]

@elasticmachine update branch