# Why does client.version field does not exist?
**URL:** https://discuss.elastic.co/t/why-does-client-version-field-does-not-exist/345896
**Category:** Elasticsearch
**Tags:** ecs-elastic-common-schema
**Created:** [October 27, 2023, 8:47am UTC](https://discuss.elastic.co/t/why-does-client-version-field-does-not-exist/345896 "2023-10-27T08:47:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@babs](https://discuss.elastic.co/u/babs)
#### Post date: [October 27, 2023, 8:47am UTC](https://discuss.elastic.co/t/why-does-client-version-field-does-not-exist/345896/1 "2023-10-27T08:47:10Z")
Hello,
I wonder why the `client.version` field does not exist in the ECS ?
Does it have to be a custom field ?
There is a `agent.version`, a `service.version`, but `client.version` does not exist.
Edit: I see that `server.version` and `source.version` do not exist either, it seems related (to the thing I don't get 😅).
Usecase: I have to process vpn server logs, the client version appears in the logs, and I want to store it. I can obviously make a custom `vpn.client.version` but I thought there was a more generic approach.
TY in advance for your response,
Babs
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### Author:  [@ebeahan](https://discuss.elastic.co/u/ebeahan)
#### Post date: [October 27, 2023, 1:55pm UTC](https://discuss.elastic.co/t/why-does-client-version-field-does-not-exist/345896/2 "2023-10-27T13:55:27Z")
Hi, @babs!
In ECS the `client.*` fields describes the initiator of a network connection between a client/server. The type of software client you're describing is often a good candidate to use the `service.*` fields.
ECS defines `service.origin.version` as a [nesting](https://www.elastic.co/guide/en/ecs/current/ecs-service.html#ecs-service-nestings) of `service.*`, and I see the field being a good fit for your use case.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 24, 2023, 1:56pm UTC](https://discuss.elastic.co/t/why-does-client-version-field-does-not-exist/345896/3 "2023-11-24T13:56:11Z")
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