[skip ci]Add some comments in chap03_index_service.md (#11761)

Signed-off-by: ruiyi.jiang <ruiyi.jiang@zilliz.com>
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ryjiang 2021-11-15 09:15:18 +08:00 committed by GitHub
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@ -154,6 +154,7 @@ type NotifyBuildIndexRequest struct {
```go
type IndexNode interface {
Component
// TimeTickProvider is the interface all services implement
TimeTickProvider
// CreateIndex receives requests from IndexCoordinator to build an index.