[search] Error handling for "search_context_missing_exception"

Search service the following error with 500 error code for the 500 POST SearchApi/queryWithCursor request.

[45764380]"}},{"shard":-1,"index":null,"reason":{"type":"search_context_missing_exception","reason":"No search context found for id [45764379]"}}],"caused_by":{"type":"search_context_missing_exception","reason":"No search context found for id [45764379]"}},"status":404} {account-id=opendes, correlation-id=bdf191ee-b7ec-46bd-9e1e-0bbc686228d7, data-partition-id=opendes}

POST SearchApi/queryWithCursor request must handle this and give user proper error message.