Term facet with a pattern analyzed field

query.sh

curl -s -XPUT localhost:9200/_template/template_tags -d '{
    "template" : "tags*",
    "settings" : {
         "index.analysis.analyzer.csv.type" : "pattern",
    	 "index.analysis.analyzer.csv.pattern" : ","
    },
    "mappings" : {
        "_default_" : {
            "properties" : {
            	"tags" : {
            		"type" : "string",
            		"analyzer" : "csv",
            		"store" : "yes"
            	}
            }
        }
    }
}'
echo
curl -s -XPUT 'localhost:9200/tags'
echo
curl -s -XPUT 'localhost:9200/tags/tag/1' -d '{
	"tags" : "a-b,a-b,a-c"
}'
curl -s -XPOST 'localhost:9200/_refresh'
echo
curl -s -XPOST 'localhost:9200/tags/_search' -d '{
	"facets" : {
		"tags" : {
			"terms" : {
				"field" : "tags"
			}
		}
	}
}'
echo