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
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Results of the search across the views:
Query example /orders-storage/order-lines?query=purchaseOrder.workflowStatus==Pending and cost.listUnitPrice==21.0
As you can see every search requests takes almost 2 seconds
Results of the search via cross index approach:
Query example differs a bit according to cross index syntax: /orders-storage/order-lines?query=purchaseOrder.workflowStatus==Pending and cost.listUnitPrice==21.0
As you can see every search requests takes less than 200 ms
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