Speeding up dam:AssetContent search query in CQ 5.6.1

Have been analysing slow component, came to conclusion that it is due to the slow running Query:

map.put("property","jcr:primaryType"); map.put("property.value","dam:AssetContent"); map.put("2_group.property","metadata/item:enabled"); map.put("2_group.property.1_value","true"); map.put("orderby","@jcr:lastModified"); map.put("orderby.sort","desc");

Have come across this document: https://helpx.adobe.com/experience-manager/kb/SearchIndexingConfig.html

This document desribes functionality for CQ 5.4 and CQ 5.5 it does not describe changes that have happened in CQ 5.6.1.

Would optimization to the indexing_config.xml help in this particular case, where is the config file located in 5.6.1?

Was thinking to add following config to the file:

<aggregate primaryType="dam:AssetContent"> <include>*</include> <include>*/*</include>     <include>*/*/*</include> </aggregate>

Would this help or is there easier route to increase Query speed?

Thanks,

Peter