How can I use REST api to get scheduled searches?

[nsleden]

I am able to get results with this:

curl -k -u ${SPLUNK_USER}:${SPLUNK_PASSWORD} -X GET https://{$SPLUNK_URL}/servicesNS/-/-/saved/searches?search="\(eai:acl.owner='username'\)"\&count=0

but I would also like to return only those that are scheduled.  I tried to add:

?search="\(eai:acl.owner='username'\) AND \(is_scheduled=1\)"\&count=0

but it returns 0. I also tried with only this:

?search="\(is_scheduled=1\)"\&count=0

and it returns 0. I am not sure how to make the is_scheduled work.

Thanks!