Ensure option text attributes values are using their "parent" field p…

[romainruaud]

…arameters for search usage : spellcheck, autocomplete, searchable, etc...

This is a fix for #94 and should be merge in master and 2.2.x

[romainruaud]

I updated the PR. You were right, I broke some parts :)

See before/after on mapping :

BEFORE :

        "manufacturer" : {
            "type" : "integer",
            "fielddata" : {
              "format" : "doc_values"
            }
          }
        "option_text_manufacturer" : {
            "type" : "string",
            "analyzer" : "standard",
            "fielddata" : {
              "format" : "lazy"
            },
            "fields" : {
              "shingle" : {
                "type" : "string",
                "analyzer" : "shingle",
                "fielddata" : {
                  "format" : "lazy"
                }
              },
              "untouched" : {
                "type" : "string",
                "index" : "not_analyzed",
                "fielddata" : {
                  "format" : "doc_values"
                }
              },
              "whitespace" : {
                "type" : "string",
                "analyzer" : "whitespace",
                "fielddata" : {
                  "format" : "lazy"
                }
              }
            },
            "copy_to" : [ "search" ]
          }

and AFTER :

        "manufacturer" : {
            "type" : "integer",
            "fielddata" : {
              "format" : "doc_values"
            }
          },
       "option_text_manufacturer" : {
            "type" : "string",
            "analyzer" : "standard",
            "fielddata" : {
              "format" : "lazy"
            },
            "fields" : {
              "phonetic" : {
                "type" : "string",
                "analyzer" : "phonetic",
                "fielddata" : {
                  "format" : "lazy"
                }
              },
              "shingle" : {
                "type" : "string",
                "analyzer" : "shingle",
                "fielddata" : {
                  "format" : "lazy"
                }
              },
              "untouched" : {
                "type" : "string",
                "index" : "not_analyzed",
                "fielddata" : {
                  "format" : "doc_values"
                }
              },
              "whitespace" : {
                "type" : "string",
                "analyzer" : "whitespace",
                "fielddata" : {
                  "format" : "lazy"
                }
              }
            },
            "copy_to" : [ "search", "spelling" ]
          }