REST API Call for size of written ES data

Hi all,
there is the REST API call:
/System/ClusterTraffic : Cluster traffic stats
This returns a value, which I don’t know how to interpret.
“from”: “2019-06-22T07:00:00.000Z”,
“to”: “2019-06-27T07:00:00.000Z”,
“input”: {
“2019-06-22T00:00:00.000Z”: 4607582074,
“2019-06-23T00:00:00.000Z”: 6882726102,
“2019-06-24T00:00:00.000Z”: 14629782031,
“2019-06-25T00:00:00.000Z”: 17217875574,
“2019-06-26T00:00:00.000Z”: 15879060627,
“2019-06-27T00:00:00.000Z”: 4057561992
“output”: {
“2019-06-22T00:00:00.000Z”: 6348141388,
“2019-06-23T00:00:00.000Z”: 9408288606,
“2019-06-24T00:00:00.000Z”: 12895694142,
“2019-06-25T00:00:00.000Z”: 13277459469,
“2019-06-26T00:00:00.000Z”: 12044597114,
“2019-06-27T00:00:00.000Z”: 3303939292
“decoded”: {
“2019-06-22T00:00:00.000Z”: 4677104398,
“2019-06-23T00:00:00.000Z”: 6920494793,
“2019-06-24T00:00:00.000Z”: 13293414769,
“2019-06-25T00:00:00.000Z”: 14575197669,
“2019-06-26T00:00:00.000Z”: 13738413389,
“2019-06-27T00:00:00.000Z”: 3716117027
Is this kBytes or Bytes? Or is it the number of messages?
And what is the difference between “decoded” and “output”.

Actually I would love to get the values which I can see in System/Overview in “Outgoing Traffic”.
Is there an API call for this?

Thanks in advance,


He Dietmar,

the following documentation page should help with that:

Hello Jan,

thanks a lot for the hint to the right doku.



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