Actually that means: Search and Classification.

SAP NetWeaver Search and Classification (TREX) finds information in both structured and unstructured data. TREX provides SAP applications with services for searching and classifying large collections of documents and for searching and aggregating business objects.

The Search Engine Service (SES) enables users to search for business objects. SES is part of the SAP NetWeaver Application Server and accesses TREX functions through the TREX ABAP client.

I started with checking all settings of TREX in our Knowledge Warehouse system. It seems to me not all settings have been done in the past, because there is very slow performance when try to load pdf files from KWH system.

I will put documentation what I found and what should be checked.