[skip e2e] Add comment for setReadyLoad (#13649)

Signed-off-by: bigsheeper <yihao.dai@zilliz.com>

internal/querynode/index_info.go

@@ -65,6 +65,7 @@ func (info *indexInfo) setIndexParams(params map[string]string) {
 	info.indexParams = params
 }
 
+// setReadyLoad the the flag to check if the index is ready to load
 func (info *indexInfo) setReadyLoad(load bool) {
 	info.readyLoad = load
 }