fix: synonym analyzer (#87)

* feat: add template for searchable fields

* fix: add lang + synonyms mapping

* feat: add template for v6 + synonyms analyzer

* fix: synonym analyzer

Author: lakhansamani

util/es_template.go

@@ -102,7 +102,7 @@ func SetDefaultIndexTemplate() error {
 						},
 						"synonyms": {
 							"type": "text",
-							"analyzer": "synonym"
+							"analyzer": "synonyms"
 						},
 						"lang": {
 							"type": "text",