aelmaarouf commented on PR #14927:
URL: https://github.com/apache/beam/pull/14927#issuecomment-1595848890
Hello,
I'm sorry to bring up this old discussion but it's the only thing i found so
far (i can create an issue if you prefer).
I have a hard time to understand the difference between *withFindKey* and
*withUpdateKey* can anyone please explain it to me ?
Here is my issue : I have a Mongo document like this
```
{
"_id" : objectId,
"patientId" : "u-u-id",
"therapyDate" : 1283839993, // timestamp
"value": x
}
```
I know that the combination (patientId and therapyDate) is unique so i am
using the following update configuration :
```
.withFindKey("patientId")
.withFindKey("therapyDate")
.withUpdateFields( UpdateField.fieldUpdate("$set","value", "value"))
```
Using this configuration a new document is created instead of updating the
existing one. Can you point me to the proper direction to update this kind of
documents (not depending on the _id as updatekey) ?
thanks in advance
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