Add custom_field_analyzers Option

[tonysun83]

This new option allows users to create separate analyzers for
fields that will be used for text indexes.

COUCHDB-3278

[mayya-sharipova]

@tonysun83
This doesn't work for me as expected. Please see if I am doing something wrong:

I have created CQ search index using command:

curl -X POST -H "Content-Type: application/json" http://adm:pass@127.0.0.1:5984/movies/_index -d '{"index": {"fields":[{"name": "Movie_name", "type": "string"}], "custom_field_analyzers":[{"Movie_name" : "standard"}]}, "ddoc" : "ddoc1", "name" : "mindex", "type": "text"}'

Then, I expect that using this command:
curl -X POST -H "Content-Type: application/json" http://adm:pass@127.0.0.1:5984/movies/_find -d '{"selector": {"Movie_name": "Lethal"}, "use_index": "_design/ddoc1"}', I should find some docs, but I get no results in return:

{
  "docs": [],
  "bookmark": "g2o"
}

While running: curl -X POST -H "Content-Type: application/json" http://adm:pass@127.0.0.1:5984/movies/_find -d '{"selector": {"$text": "Lethal"}, "use_index": "_design/ddoc1"}'

I get the expected results:

{
  "docs": [
    {
      "_id": "df8cecd9809662d08eb853989a2bdab2",
      "_rev": "1-7ee437111642cabca89aa0c7ca3f7a48",
      "Movie_runtime": 118,
      "Movie_rating": "R",
      "Person_name": "Joe Pesci",
      "Actor_actor_id": "0000582",
      "Movie_genre": "ACT",
      "Movie_name": "Lethal Weapon 3",
      "Actor_movie_id": "0104714",
      "Person_pob": "Newark, New Jersey, USA",
      "Person_id": "0000582",
      "Movie_id": "0104714",
      "Movie_year": 1992,
      "Person_dob": "1943-02-09"
    },
....

I seems that even I specified "custom_field_analyzers":[{"Movie_name" : "standard"}], Movie_name field is still using keyword analyzer.