ESH_S_IF_TEMPLATE_INSTANCE is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Template Instance/Search Connector" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_ESH_S_IF_TEMPLATE_INSTANCE TYPE ESH_S_IF_TEMPLATE_INSTANCE.
The ESH_S_IF_TEMPLATE_INSTANCE table consists of various fields, each holding specific information or linking keys about Template Instance/Search Connector data available in SAP. These include TEMPLATE_ID (Search Connector Template ID), LOGSYS (Logical system), SEARCH_CONNECTOR_ID (Search Connector ID)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .