Setting index_analyzer incorrectly sets analyzer

[clintongormley]

Setting just index_analyzer incorrectly sets analyzer:

curl -XPUT 'http://127.0.0.1:9200/test/?pretty=1'  -d '
{
   "mappings" : {
      "test" : {
         "properties" : {
            "foo" : {
               "index_analyzer" : "whitespace",
               "type" : "string"
            }
         }
      }
   }
}
'

curl -XGET 'http://127.0.0.1:9200/test/test/_mapping?pretty=1' 

# {
#    "test" : {
#       "properties" : {
#          "foo" : {
#             "type" : "string",
#             "analyzer" : "whitespace"
#          }
#       }
#    }
# }

[kimchy]

The logic here was that if you set the index_analyzer then you would almost always want to set the search_analyzer as well, so we do it automatically. But then, it was before we had the analyzer setting, now, its confusing, agreed. Will fix it.