Analyzer does not include indices to use in requests

[jonathan-buttner]

Kibana version:
7.11

Describe the bug:
When viewing the graphical analyzer view for a process graph, the UI does not populate the indices field of the request to the backend. I believe this causes the backend to query all local indices in ES. This fails for CCS where the events are not located on the local ES instance.

Steps to reproduce:
Open the analyzer and observe the network requests in the developer tools.

Expected behavior:
indexPatterns is populated with the same values as the /tree API request.

Screenshots (if relevant):

/tree request has the correct values

Notice that the /events API's indexPatterns is an empty array.

Other context:
I believe the issue is that this selector is being called:
https://github.com/elastic/kibana/blob/master/x-pack/plugins/security_solution/public/resolver/store/data/selectors.ts#L289

which returns null after the /tree API has returned. A new selector likely needs to be created to return the appropriate parameters depending on the state of the /tree request.

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)

[jonathan-buttner]

cc: @aarju