Requirements: 
MODORDERS-488 Investigate transition of Orders search to cross-index subqueries
Overview:
Endpoints calling views:
/orders-storage/receiving-history → receiving_history_view
/orders-storage/orders → orders_view
/orders-storage/po-lines → po_lines_view
/orders-storage/order-lines → order_lines_view
Prepared a POC with migration of this endpoint from searching accross the views to the searching via cross-indexes
...
Results of the search via cross index approach:
As you can see every search requests takes less than 200 ms
So switching implementation from views to the cross index search improves perfomance about 10 times.