[data.search] Send ccs_minimize_roundtrips=true for async search requests (#159848)

## Summary

Resolves https://github.com/elastic/kibana/issues/159706. Sends
`ccs_minimize_roundtrips=true` for async search requests to decrease
network delays when cross-cluster search is at play.

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

src/plugins/data/server/search/strategies/ese_search/request_utils.test.ts

@@ -111,6 +111,19 @@ describe('request utils', () => {
       });
       expect(params).toHaveProperty('keep_on_completion', false);
     });
+
+    test('Sets `batched_reduce_size` and `ccs_minimize_roundtrips`', async () => {
+      const mockUiSettingsClient = getMockUiSettingsClient({
+        [UI_SETTINGS.SEARCH_INCLUDE_FROZEN]: false,
+      });
+      const batchedReduceSize = Math.floor(Math.random() * 64);
+      const mockConfig = getMockSearchConfig({
+        asyncSearch: { batchedReduceSize },
+      });
+      const params = await getDefaultAsyncSubmitParams(mockUiSettingsClient, mockConfig, {});
+      expect(params).toHaveProperty('batched_reduce_size', batchedReduceSize);
+      expect(params).toHaveProperty('ccs_minimize_roundtrips', true);
+    });
   });
 
   describe('getDefaultAsyncGetParams', () => {

src/plugins/data/server/search/strategies/ese_search/request_utils.ts

@@ -38,6 +38,7 @@ export async function getDefaultAsyncSubmitParams(
   Pick<
     AsyncSearchSubmitRequest,
     | 'batched_reduce_size'
+    | 'ccs_minimize_roundtrips'
     | 'keep_alive'
     | 'wait_for_completion_timeout'
     | 'ignore_throttled'
@@ -50,6 +51,8 @@ export async function getDefaultAsyncSubmitParams(
   return {
     // TODO: adjust for partial results
     batched_reduce_size: searchConfig.asyncSearch.batchedReduceSize,
+    // Decreases delays due to network when using CCS
+    ccs_minimize_roundtrips: true,
     ...getCommonDefaultAsyncSubmitParams(searchConfig, options),
     ...(await getIgnoreThrottled(uiSettingsClient)),
     ...(await getDefaultSearchParams(uiSettingsClient)),