Some ids are still saved within attributes of saved objects and not into references

[mikecote]

Based on a few CI logs I've added in a branch (#30418), I've created a list of object types and paths I've noticed are still storing ids within attributes. Not all below need to be converted but need to be discussed with impact on saved object export / import.

Object Type: config
Path: attributes.defaultIndex

Object Type: url
Path: attributes.url

Object Type: visualization
Path: attributes.visState.params.controls[x].indexPattern

Object Type: map
Path: attributes.layerListJSON[x].sourceDescriptor.indexPatternId
Path: attributes.layerListJSON[x].joins[x].right.indexPatternId

Object Type: canvas
Path: attributes.id

[elasticmachine]

Pinging @elastic/kibana-platform

[mikecote]

Added the following to the description:
Object Type: map
Path: attributes.layerListJSON[x].joins[x].right.indexPatternId

Object Type: canvas
Path: attributes.id

[mikecote]

As discussed with @spalger, we'll skip url and config for now as they won't be part of import / export. I will create a PR to resolve visualization and canvas.

GIS team is working on a PR for map.

[mikecote]

#31745 will resolve map and then this issue can be closed.