Oipo edited a comment on pull request #285:
URL: https://github.com/apache/celix/pull/285#issuecomment-698164298


   I believe the X-Etcd-Index value is tied to a key. 
   
   If we take a look at the [etcd API](https://etcd.io/docs/v2/api/) 
description:
   
   > node.createdIndex: an index is a unique, monotonically-incrementing 
integer created for each change to etcd. This specific index reflects the point 
in the etcd state member at which a given key was created. You may notice that 
in this example the index is 2 even though it is the first request you sent to 
the server. This is because there are internal commands that also change the 
state behind the scenes, like adding and syncing servers.
   
   It's probably best to do an `etcdlib_get()` before an `etcdlib_watch()`. If 
the return value is ETCDLIB_RC_ERROR, you can assume it is 0.
   
   Verifying this locally:
   ```
   oipo@oipo-X570-AORUS-ELITE:~$ curl http://127.0.0.1:2379/v2/keys/message3
   {"errorCode":100,"message":"Key not found","cause":"/message3","index":5266}
   oipo@oipo-X570-AORUS-ELITE:~$ curl http://127.0.0.1:2379/v2/keys
   
{"action":"get","node":{"dir":true,"nodes":[{"key":"/hier","dir":true,"modifiedIndex":13,"createdIndex":13}]}}
   ```


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