[Fleet] removed restriction to use remote es as integration data (#173353)

## Summary

Closes https://github.com/elastic/kibana/issues/173237

Removed restriction to allow using remote es output as integration data
output.

### Steps to verify:

#### Send system integration data to remote es
- Create a remote es output, verify that the output is allowed to be set
as default for agent integrations
- Create an agent policy with system integration and set the remote es
output as integration data output
- Enroll an agent to the agent policy
- Check the remote kibana - Discover, verify that system metrics are
coming in from the agent
- Install system package on the remote cluster to see dashboards,
mappings, etc.
#### Send nginx integration data to remote es
- Add nginx integration to the agent policy
- Create a dummy nginx log file in `/var/tmp/nginx/access.log` and add
some dummy data to it
- Verify that the data from the nginx log file appears in the remote
kibana Discover in `logs-*` data view.
#### Back to default output
- Change the agent policy integration output back to default
- Verify that the system integration data is ingested in the main
cluster.
- Verify that the API key is invalidated in the remote cluster

<img width="1742" alt="image"
src="47ed4e89-e761-4f24-90c3-bf3a49a6b4f1">

<img width="937" alt="image"
src="2e41f37e-a4ef-4f18-aed0-d4160efe306a">

<img width="2162" alt="image"
src="bf5d900b-f3bd-493e-b61a-4554224a97fc">

<img width="2150" alt="image"
src="31e4f32e-8751-4b02-855f-dc7fbd5e64a9">

System dashboard on remote cluster populated:
<img width="2157" alt="image"
src="dfb10791-ab15-4058-9170-7cad51935493">


### 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

x-pack/plugins/fleet/common/services/output_helpers.ts

@@ -28,9 +28,9 @@ export function getAllowedOutputTypeForPolicy(agentPolicy: AgentPolicy) {
     agentPolicy.package_policies &&
     agentPolicy.package_policies.some(
       (p) =>
-        p.package?.name === FLEET_APM_PACKAGE ||
         p.package?.name === FLEET_SERVER_PACKAGE ||
-        p.package?.name === FLEET_SYNTHETICS_PACKAGE
+        p.package?.name === FLEET_SYNTHETICS_PACKAGE ||
+        p.package?.name === FLEET_APM_PACKAGE
     );
 
   if (isRestrictedToSameClusterES) {

x-pack/plugins/fleet/public/applications/fleet/sections/agent_policy/components/agent_policy_advanced_fields/hooks.test.tsx

@@ -533,7 +533,7 @@ describe('useOutputOptions', () => {
     `);
   });
 
-  it('should only enable remote es output for monitoring output', async () => {
+  it('should enable remote es output for data and monitoring output', async () => {
     const testRenderer = createFleetTestRendererMock();
     mockedUseLicence.mockReturnValue({
       hasAtLeast: () => true,
@@ -545,7 +545,8 @@ describe('useOutputOptions', () => {
     expect(result.current.isLoading).toBeTruthy();
 
     await waitForNextUpdate();
-    expect(result.current.dataOutputOptions.length).toEqual(1);
+    expect(result.current.dataOutputOptions.length).toEqual(2);
+    expect(result.current.dataOutputOptions[1].value).toEqual('remote1');
     expect(result.current.monitoringOutputOptions.length).toEqual(2);
     expect(result.current.monitoringOutputOptions[1].value).toEqual('remote1');
   });

x-pack/plugins/fleet/public/applications/fleet/sections/agent_policy/components/agent_policy_advanced_fields/hooks.tsx

@@ -16,7 +16,7 @@ import {
   useGetDownloadSources,
   useGetFleetServerHosts,
 } from '../../../../hooks';
-import { LICENCE_FOR_PER_POLICY_OUTPUT, outputType } from '../../../../../../../common/constants';
+import { LICENCE_FOR_PER_POLICY_OUTPUT } from '../../../../../../../common/constants';
 import {
   getAllowedOutputTypeForPolicy,
   policyHasFleetServer,
@@ -99,28 +99,26 @@ export function useOutputOptions(agentPolicy: Partial<NewAgentPolicy | AgentPoli
 
     return [
       getDefaultOutput(defaultOutputName, defaultOutputDisabled, defaultOutputDisabledMessage),
-      ...outputsRequest.data.items
-        .filter((item) => item.type !== outputType.RemoteElasticsearch)
-        .map((item) => {
-          const isOutputTypeUnsupported = !allowedOutputTypes.includes(item.type);
+      ...outputsRequest.data.items.map((item) => {
+        const isOutputTypeUnsupported = !allowedOutputTypes.includes(item.type);
 
-          return {
-            value: item.id,
-            inputDisplay: getOutputLabel(
-              item.name,
-              isOutputTypeUnsupported ? (
-                <FormattedMessage
-                  id="xpack.fleet.agentPolicyForm.outputOptionDisabledTypeNotSupportedText"
-                  defaultMessage="{outputType} output for agent integration is not supported for Fleet Server, Synthetics or APM."
-                  values={{
-                    outputType: item.type,
-                  }}
-                />
-              ) : undefined
-            ),
-            disabled: !isPolicyPerOutputAllowed || isOutputTypeUnsupported,
-          };
-        }),
+        return {
+          value: item.id,
+          inputDisplay: getOutputLabel(
+            item.name,
+            isOutputTypeUnsupported ? (
+              <FormattedMessage
+                id="xpack.fleet.agentPolicyForm.outputOptionDisabledTypeNotSupportedText"
+                defaultMessage="{outputType} output for agent integration is not supported for Fleet Server, Synthetics or APM."
+                values={{
+                  outputType: item.type,
+                }}
+              />
+            ) : undefined
+          ),
+          disabled: !isPolicyPerOutputAllowed || isOutputTypeUnsupported,
+        };
+      }),
     ];
   }, [outputsRequest, isPolicyPerOutputAllowed, allowedOutputTypes]);
 

x-pack/plugins/fleet/public/applications/fleet/sections/settings/components/edit_output_flyout/index.tsx

@@ -542,7 +542,6 @@ export const EditOutputFlyout: React.FunctionComponent<EditOutputFlyoutProps> =
                   }}
                 />
               }
-              disabled={isRemoteESOutput}
             />
           </EuiFormRow>
           <EuiFormRow fullWidth {...inputs.defaultMonitoringOutputInput.formRowProps}>

x-pack/plugins/fleet/server/services/output.test.ts

@@ -705,12 +705,12 @@ describe('Output Service', () => {
       );
     });
 
-    it('should throw when a remote es output is attempted to be created as default data output', async () => {
+    it('should not throw when a remote es output is attempted to be created as default data output', async () => {
       const soClient = getMockedSoClient({
         defaultOutputId: 'output-test',
       });
 
-      await expect(
+      expect(
         outputService.create(
           soClient,
           esClientMock,
@@ -722,9 +722,7 @@ describe('Output Service', () => {
           },
           { id: 'output-1' }
         )
-      ).rejects.toThrow(
-        `Remote elasticsearch output cannot be set as default output for integration data. Please set "is_default" to false.`
-      );
+      ).resolves.not.toThrow();
     });
 
     it('should set preset: balanced by default when creating a new ES output', async () => {
@@ -1644,21 +1642,19 @@ describe('Output Service', () => {
       );
     });
 
-    it('should throw when a remote es output is attempted to be updated as default data output', async () => {
+    it('should not throw when a remote es output is attempted to be updated as default data output', async () => {
       const soClient = getMockedSoClient({
         defaultOutputId: 'output-test',
       });
 
-      await expect(
+      expect(
         outputService.update(soClient, esClientMock, 'output-test', {
           is_default: true,
           is_default_monitoring: false,
           name: 'Test',
           type: 'remote_elasticsearch',
         })
-      ).rejects.toThrow(
-        `Remote elasticsearch output cannot be set as default output for integration data. Please set "is_default" to false.`
-      );
+      ).resolves.not.toThrow();
     });
   });
 

x-pack/plugins/fleet/server/services/output.ts

@@ -441,13 +441,6 @@ class OutputService {
     logger.debug(`Creating new output`);
 
     const data: OutputSOAttributes = { ...omit(output, ['ssl', 'secrets']) };
-    if (output.type === outputType.RemoteElasticsearch) {
-      if (data.is_default) {
-        throw new OutputInvalidError(
-          'Remote elasticsearch output cannot be set as default output for integration data. Please set "is_default" to false.'
-        );
-      }
-    }
 
     if (outputTypeSupportPresets(data.type)) {
       if (
@@ -767,14 +760,6 @@ class OutputService {
     const logger = appContextService.getLogger();
     logger.debug(`Updating output ${id}`);
 
-    if (data.type === outputType.RemoteElasticsearch) {
-      if (data.is_default) {
-        throw new OutputInvalidError(
-          'Remote elasticsearch output cannot be set as default output for integration data. Please set "is_default" to false.'
-        );
-      }
-    }
-
     let secretsToDelete: PolicySecretReference[] = [];
     const originalOutput = await this.get(soClient, id);