MB-30075: Handle the index creation case with URL parameters

Handle the case where the index/alias is to be created without
a request body, and all that is necessary is passed in as form
parameters.

Change-Id: Ib9123242e10d4e5c5781f3e23f234441c5edc046
Reviewed-on: http://review.couchbase.org/95524
Well-Formed: Build Bot <build@couchbase.com>
Reviewed-by: Steve Yen <steve.yen@gmail.com>
Tested-by: Abhinav Dangeti <abhinav@couchbase.com>

rest_auth.go

@@ -292,6 +292,12 @@ func findCouchbaseSourceNames(req *http.Request, indexName string,
 		}
 	}
 
+	if indexDef.Type == "" {
+		// if indexType wasn't found in the request body, attempt reading it
+		// from the form entries.
+		indexDef.Type = req.FormValue("indexType")
+	}
+
 	if indexDef.Type == "fulltext-index" {
 		sourceType, sourceName := rest.ExtractSourceTypeName(req, &indexDef, indexName)
 		if sourceType == "couchbase" {