The data summary page/panels executes "|metadata " command without specify the index (e.g. "| metadata type=sourcetypes | search totalCount>0 " for sourcetypes). Just add your index specification after type=sourcetypes to show the same summary for that index.
e.g. | metadata type=sourcetypes index=myindex| search totalCount>0 | rename totalCount as Count recentTime as "Last Update"
You can use wildcards, OR separated multiple conditions as well.
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Note that metadata
without specifying an index will search the user's default index(es). Add your indexes to the default indexes for your user's role and you'll get your summary over all those indexes.