You are looking at documentation for an alpha release.
Docker fields
editDocker fields
editThis functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.
Docker stats collected from Docker.
docker.container.id
edittype: keyword
Unique container id.
docker.container.image
edittype: keyword
Name of the image the container was built on.
docker.container.name
edittype: keyword
Container name.
docker.container.labels
edittype: object
Image labels.