[ES|QL] Add MATCH_PHRASE

[kderusso]

Adds MATCH_PHRASE support to ES|QL.

Some examples of how to use MATCH_PHRASE:

POST _query?format=txt
{
  "query": """
  FROM books METADATA _score
  | WHERE MATCH_PHRASE(title, "return of the king")
  | KEEP title, _score
  | SORT _score
  | LIMIT 5
  """
}

POST _query?format=txt
{
  "query": """
  FROM books METADATA _score
  | WHERE MATCH_PHRASE(title, "return of king", {"slop": 5})
  | KEEP title, _score
  | SORT _score
  | LIMIT 5
  """
}

POST _query?format=txt
{
  "query": """
  FROM books METADATA _score
  | WHERE MATCH_PHRASE(title, "return of king", {"analyzer": "whitespace"})
  | KEEP title, _score
  | SORT _score
  | LIMIT 5
  """
}

POST _query?format=txt
{
  "query": """
  FROM books METADATA _score
  | WHERE MATCH_PHRASE(title, "", {"zero_terms_query": "all"})
  | KEEP title, _score
  | SORT _score
  | LIMIT 5
  """
}

[elasticsearchmachine]

Hi @kderusso, I've created a changelog YAML for you.

[kderusso]

Note: When I try to link to the correct doclink here, I get:

Invalid link key <<match-phrase-field-params,match_phrase query parameters>>

[kderusso]

I'm not sure why we're picking up match query docs in the generated documentation here, we should be picking up query-dsl-match-query-phrase.md.

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)

[elasticsearchmachine]

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

[elasticsearchmachine]

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