PCBC-696: Fix typo in QueryString search query

Change-Id: I4131efb733fa6779bc5e3761801d3a024668d5e2
Reviewed-on: http://review.couchbase.org/c/php-couchbase/+/130575
Reviewed-by: Sergey Avseyev <[email protected]>
Tested-by: Build Bot <[email protected]>

Author: avsej

src/couchbase/search/query_string_query.c

@@ -62,7 +62,7 @@ PHP_METHOD(QueryStringSearchQuery, jsonSerialize)
     zval *prop, ret;
     prop = zend_read_property(pcbc_query_string_search_query_ce, getThis(), ZEND_STRL("value"), 0, &ret);
     if (Z_TYPE_P(prop) != IS_NULL) {
-        add_assoc_zval(return_value, "query_string", prop);
+        add_assoc_zval(return_value, "query", prop);
         Z_TRY_ADDREF_P(prop);
     }