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[skip e2e]Update milvus component names (#14408)

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Signed-off-by: yanliang567 <yanliang.qiao@zilliz.com>
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docs/design_docs/root_coordinator_recovery_on_power_failure.md
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@ -51,7 +51,7 @@
### 2.5 Flushed segment from `data node`
1. Each time the `data node` finishes flushing a segment, it sends the segment id to the `RC` via msgstream.
1. Each time the `DataNode` finishes flushing a segment, it sends the segment id to the `RootCoord` via msgstream.
2. `RootCoord` needs to fetch binlog from `DataCoord` by id and send a request to `IndexCoord` to create an index on this segment.
3. When the `IndexCoord` is called successfully, it will return a build id, and then `RootCoord` will update the build id to the `collection meta` and record the position of the msgstream in etcd.
4. Step 3 is transactional and the operation will be successful only if the `collection meta` in etcd is updated.