Indexed Search
1.4.8. Grouping more indexing configurations in one search category
You might find that you want to group the results from multiple indexing configurations in the same category. For instance, I have an indexing configuration for both "TYPO3.org" and "TYPO3.com" but I want all search results to appear under the category "External URLs". This can be done by creating a special type of indexing configuration which only points to other indexing configurations:

This indexing configuration is not used during indexing but during searching. So a reconfiguration of the TypoScript to use uid 9 instead of 7,8 will yield this result:

TypoScript:
plugin.tx_indexedsearch.search.defaultFreeIndexUidList = 9,6,0