Default query rewriting to false

Author: pamelafox

infra/main.parameters.json

@@ -81,7 +81,7 @@
       "value": "${AZURE_SEARCH_SEMANTIC_RANKER=free}"
     },
     "searchServiceQueryRewriting": {
-      "value": "${AZURE_SEARCH_QUERY_REWRITING}"
+      "value": "${AZURE_SEARCH_QUERY_REWRITING=false}"
     },
     "storageAccountName": {
       "value": "${AZURE_STORAGE_ACCOUNT}"