elasticsearch mapping tokenizer keyword to avoid splitting tokens and enable use of wildcard

Question

I try to make an autocomplete function with angularjs and elasticsearch on a given field, for example countryname. it can contain simple names like \"France\",

Answer 1

i found a working solution : the "keyword" tokenizer. create a custom analyzer and use it in the mapping for the field i want to keep without split by space :

    curl -XPUT 'localhost:9200/botanic/' -d '{
 "settings":{
     "index":{
        "analysis":{
           "analyzer":{
              "keylower":{
                 "tokenizer":"keyword",
                 "filter":"lowercase"
              }
           }
        }
     }
  },
  "mappings":{
        "specimens" : {
            "_all" : {"enabled" : true},
            "_index" : {"enabled" : true},
            "_id" : {"index": "not_analyzed", "store" : false},
            "properties" : {
                "_id" : {"type" : "string", "store" : "no","index": "not_analyzed"  } ,
            ...
                "LOCATIONID" : {"type" : "string",  "store" : "yes","index": "not_analyzed" } ,
                "AVERAGEALTITUDEROUNDED" : {"type" : "string",  "store" : "yes","index": "analyzed" } ,
                "CONTINENT" : {"type" : "string","analyzer":"keylower" } ,
                "COUNTRYNAME" : {"type" : "string","analyzer":"keylower" } ,                
                "COUNTRYCODE" : {"type" : "string", "store" : "yes","index": "analyzed" } ,
                "COUNTY" : {"type" : "string","analyzer":"keylower" } ,
                "LOCALITY" : {"type" : "string","analyzer":"keylower" }                 
            }
        }
    }
}'

so i can use wildcard in query on the field COUNTRYNAME, who is not splitted :

curl -XGET 'localhost:9200/botanic/specimens/_search?size=10' -d '{
"fields"  : ["COUNTRYNAME"],     
"query": {"query_string" : {
                    "query": "COUNTRYNAME:bol*"
}},
"aggs" : {
    "general" : {
        "terms" : {
            "field" : "COUNTRYNAME", "size":0
        }
    }
}}'

the result :

{
    "took" : 14,
    "timed_out" : false,
    "_shards" : {
        "total" : 5,
        "successful" : 5,
        "failed" : 0
    },
    "hits" : {
        "total" : 45,
        "max_score" : 1.0,
        "hits" : [{
                "_index" : "botanic",
                "_type" : "specimens",
                "_id" : "91E7B53B61DF4E76BF70C780315A5DFD",
                "_score" : 1.0,
                "fields" : {
                    "COUNTRYNAME" : ["Bolivia, Plurinational State of"]
                }
            }, {
                "_index" : "botanic",
                "_type" : "specimens",
                "_id" : "7D811B5D08FF4F17BA174A3D294B5986",
                "_score" : 1.0,
                "fields" : {
                    "COUNTRYNAME" : ["Bolivia, Plurinational State of"]
                }
            } ...
        ]
    },
    "aggregations" : {
        "general" : {
            "buckets" : [{
                    "key" : "bolivia, plurinational state of",
                    "doc_count" : 45
                }
            ]
        }
    }
}