Version Conflict on Atomic Update

[Bruno René Santos]

Using the document interface on the Solr admin i try to update the
following document:

{ "responseHeader": { "status": 0, "QTime": 1, "params": { "indent": "true",
"q": "*:*", "_": "1376064413493", "wt": "json" } }, "response": { "numFound":
1, "start": 0, "docs": [ { "id": "change.me", "author": "change.me", "
author_s": "change.me", "_version_": 1442907922893897700 } ] } }

with the following change:

{
        "id": "change.me",
        "author": {"set":"change.me1"},
        "_version_": 1442907922893897700
      }

Which returns the error:

Status: error
Error: Conflict
Error:

{
  "responseHeader": {
    "status": 409,
    "QTime": 0
  },
  "error": {
    "msg": "version conflict for change.me
expected=1442907922893897700 actual=1442907922893897728",
    "code": 409
  }
}
Why this happens? I am on version 4.4
ThanxBruno


-- 
Bruno René Santos
Lisboa - Portugal