Below is the XML for a different approach to solving this problem. The nice thing about doing it this way is that it is formatted in a similar fashion to the Sources, Source types and Hosts tables that already appear on the page. Enjoy! (This was done with Splunk 5.0.4.)
<!-- The list of indexes-->
<module name="HiddenSearch" layoutPanel="panel_row2_col1" autoRun="True">
<param name="search">| rest /services/data/indexes | fields title totalEventCount updated | rename title AS index, totalEventCount AS Count, updated AS "Last Update" | fieldformat "Last Update"=strftime(strptime('Last Update', "%Y-%m-%dT%T+%3N:%6N"), "%a %b %d %T %Y UTC") | fieldformat Count=tostring(Count, "commas") | eval index=mvfilter(match(index, "^[a-z]")) | where(index!="history") | where(index!="main") | where(index!="sos") | where(index!="sos_summary_daily") | where(index!="splunklogger") | where(index!="summary") | dedup index </param>
<module name="SimpleResultsHeader">
<param name="entityName">results</param>
<param name="headerFormat">Indexes (%(count)s)</param>
<module name="Paginator">
<param name="entityName">results</param>
<param name="maxPages">10</param>
<module name="SimpleResultsTable">
<param name="entityName">results</param>
<param name="drilldown">row</param>
<module name="HiddenSearch">
<param name="search">*</param>
<module name="ConvertToIntention">
<param name="intention">
<param name="name">addterm</param>
<param name="arg">
<param name="index">$click.value$</param>
</param>
</param>
<module name="ViewRedirector">
<param name="viewTarget">flashtimeline</param>
</module>
</module>
</module>
</module>
</module>
</module>
</module>
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