string_lowercase

curl -XDELETE localhost:9200/myindex
curl -XPUT localhost:9200/myindex -d '
{
  "settings" : {
    "index":{
      "number_of_replicas":0,
      "number_of_shards":1,
      "analysis":{
        "analyzer":{          
		  "string_lowercase":{
                "type" : "custom",
                "tokenizer" : "keyword",
                "filter": ["lowercase"]
          }
        }
      }
    }
  },
  "mappings" : {
    "mytype":{  
      "properties":{           
         "Id":{
			"type":"string",
			"search_analyzer":"string_lowercase",
			"index_analyzer":"string_lowercase"
		}
	   }
   }
  }
}'

# Now, index data


curl -XPOST "http://localhost:9200/_bulk?pretty=true" -d '
{ "index" : { "_index" : "myindex", "_type" : "mytype", "_id" : "1" } }
{ "Id" : "2C4294c2-ca84-4f69-b648-8a014ff6e55d"}
'

curl -XGET "http://localhost:9200/myindex/_refresh"
echo "Searching..."
curl -XPOST "http://localhost:9200/myindex/_search?pretty=true" -d '{
  "query": {
    "term": {
      "Id": "2c4294c2-ca84-4f69-b648-8a014ff6e55d"
    }
  }
}'