index_analyzer usage not flagged

[nemonster]

Migration plugin was run on current deployment and it appears that this mapping should have been flagged. No warnings however. Seems like it may be related to #23 but that seemed to have been concerned with the check being too strict.

{
   "product": {
      "mappings": {
         "productUser": {...},
         "item": {
            "dynamic_templates": [...],
            "_all": {...},
            "properties": {
...
               "field_four": {
                  "type": "string",
                  "analyzer": "shingle_analyzer",
                  "path": "just_name",
                  "fields": {
                     "field_four_full": {
                        "type": "string",
                        "index": "not_analyzed",
                        "doc_values": true
                     },
                     "field_four_syn": {
                        "type": "string",
                        "index_analyzer": "standard",
                        "search_analyzer": "syn_analyzer"
                     }
                  }
               },
...
         },
         "catalog": {...}
      }
   }
}        

[clintongormley]

This upgrade is handled correctly by 2.0, 2.1, 2.2, 2.3 - closing