I had to look around for a bit:
Being 'admin' within the search app, my saved search 'myTestSearch' has the following REST endpoint:
Therefor the following will work:
curl -k -u admin:changeme -d 'owner=foo' -d 'sharing=app' https://localhost:8089/servicesNS/admin/search/saved/searches/myTestSearch/acl
This of course will reflect in a change of the corresponding entry within the local.meta
The next step would be giving away the owner rights of the saved search, beeing an ordinary user. Unfortunately this can not be done:
curl -k -u user:changeme -d 'owner=foo' -d 'sharing=app' https://localhost:8089/servicesNS/user/search/saved/searches/myTestSearch/acl ERROR: In handler 'savedsearch': You do not have permission to change the owner of this object.
Is there any other way to accomplish this? Maybe a dedicated capability (not adminallobjects)?
NEW FEATURE ALERT!
As of Splunk 6.6, you can now do this from the Search Head GUI with the new
Reassign Knowledge Objects feature:
Here is the main place for the documentation on using the REST API: