mongodbwriter的配置了upsertInfo，但是没有对upsertKey进行更新，还是插入所有数据。
Open
- Dominant language
- Java
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Description
配置如下：
```
"upsertInfo": {
"isUpsert": "true",
"upsertKey": "unique_id"
}
```
Contributor guide
No contributing guide indexed for this repository
Research direction
Start by reproducing the MongoDB writer behavior with the provided upsertInfo configuration and duplicate unique_id values. Trace how isUpsert and upsertKey are handled, then verify that matching unique_id values update existing records instead of inserting additional records.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java, mongodb
- Domain
- data-engineering, databases
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100