[SIEM][Detection Engine] Fixes queries to ignore errors when signals …

…index is not present (#57751)

## Summary

Fixes a bug where if you try to query the signals index and it is not present you would get an error that would bubble up to the UI.

Before:
<img width="824" alt="Screen Shot 2020-02-13 at 12 57 55 PM" src="https://user-images.githubusercontent.com/1151048/74499587-74881d00-4ea1-11ea-93b0-8d7258f79404.png">

After:
<img width="790" alt="Screen Shot 2020-02-13 at 8 43 28 PM" src="https://user-images.githubusercontent.com/1151048/74499619-9386af00-4ea1-11ea-889b-cb1853e399e3.png">

<img width="804" alt="Screen Shot 2020-02-13 at 8 43 34 PM" src="https://user-images.githubusercontent.com/1151048/74499624-971a3600-4ea1-11ea-862b-9695ecbadcbe.png">


Also fixes a regression bug with error toasters showing up when they shouldn't because of a signals index not existing. This only effects 7.6.x and master and is _not_ part of 7.6.0 at the moment.

* #57641

### Checklist

Delete any items that are not applicable to this PR.

~~- [ ] Any text added follows [EUI's writing guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses sentence case text and includes [i18n support](https://github.com/elastic/kibana/blob/master/packages/kbn-i18n/README.md)~~

~~- [ ] [Documentation](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#writing-documentation) was added for features that require explanation or tutorials~~

~~- [ ] [Unit or functional tests](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility) were updated or added to match the most common scenarios~~

~~- [ ] This was checked for [keyboard-only and screenreader accessibility](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility#Accessibility_testing_checklist)~~

~~- [ ] This renders correctly on smaller devices using a responsive layout. (You can test this [in your browser](https://www.browserstack.com/guide/responsive-testing-on-local-server)~~

~~- [ ] This was checked for cross-browser compatibility, [including a check against IE11](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility)~~

### For maintainers

~~- [ ] This was checked for breaking API changes and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)~~

x-pack/legacy/plugins/siem/public/containers/detection_engine/signals/errors_types/get_index_error.ts

@@ -8,13 +8,13 @@ import { MessageBody } from '../../../../components/ml/api/throw_if_not_ok';
 
 export class SignalIndexError extends Error {
   message: string = '';
-  statusCode: number = -1;
+  status_code: number = -1;
   error: string = '';
 
   constructor(errObj: MessageBody) {
     super(errObj.message);
     this.message = errObj.message ?? '';
-    this.statusCode = errObj.statusCode ?? -1;
+    this.status_code = errObj.status_code ?? -1;
     this.error = errObj.error ?? '';
     this.name = 'SignalIndexError';
 

x-pack/legacy/plugins/siem/public/containers/detection_engine/signals/use_signal_index.tsx

@@ -60,7 +60,7 @@ export const useSignalIndex = (): Return => {
             signalIndexName: null,
             createDeSignalIndex: createIndex,
           });
-          if (error instanceof SignalIndexError && error.statusCode !== 404) {
+          if (error instanceof SignalIndexError && error.status_code !== 404) {
             errorToToaster({ title: i18n.SIGNAL_GET_NAME_FAILURE, error, dispatchToaster });
           }
         }

x-pack/legacy/plugins/siem/server/lib/detection_engine/routes/signals/open_close_signals_route.ts

@@ -49,6 +49,7 @@ export const setSignalsStatusRouteDef = (server: ServerFacade): Hapi.ServerRoute
             },
             query: queryObject,
           },
+          ignoreUnavailable: true,
         });
       } catch (exc) {
         // error while getting or updating signal with id: id in signal index .siem-signals

x-pack/legacy/plugins/siem/server/lib/detection_engine/routes/signals/query_signals_route.ts

@@ -33,6 +33,7 @@ export const querySignalsRouteDef = (server: ServerFacade): Hapi.ServerRoute =>
         return callWithRequest(request, 'search', {
           index,
           body: { query, aggs, _source, track_total_hits, size },
+          ignoreUnavailable: true,
         });
       } catch (exc) {
         // error while getting or updating signal with id: id in signal index .siem-signals

x-pack/test/detection_engine_api_integration/security_and_spaces/tests/index.ts

@@ -25,5 +25,7 @@ export default ({ loadTestFile }: FtrProviderContext): void => {
     loadTestFile(require.resolve('./update_rules_bulk'));
     loadTestFile(require.resolve('./patch_rules_bulk'));
     loadTestFile(require.resolve('./patch_rules'));
+    loadTestFile(require.resolve('./query_signals'));
+    loadTestFile(require.resolve('./open_close_signals'));
   });
 };

x-pack/test/detection_engine_api_integration/security_and_spaces/tests/open_close_signals.ts

@@ -0,0 +1,54 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import expect from '@kbn/expect';
+
+import { DETECTION_ENGINE_SIGNALS_STATUS_URL } from '../../../../legacy/plugins/siem/common/constants';
+import { FtrProviderContext } from '../../common/ftr_provider_context';
+import {
+  createSignalsIndex,
+  deleteSignalsIndex,
+  setSignalStatus,
+  getSignalStatusEmptyResponse,
+} from './utils';
+
+// eslint-disable-next-line import/no-default-export
+export default ({ getService }: FtrProviderContext) => {
+  const supertest = getService('supertest');
+
+  describe('open_close_signals', () => {
+    describe('validation checks', () => {
+      it('should not give errors when querying and the signals index does not exist yet', async () => {
+        const { body } = await supertest
+          .post(DETECTION_ENGINE_SIGNALS_STATUS_URL)
+          .set('kbn-xsrf', 'true')
+          .send(setSignalStatus({ signalIds: ['123'], status: 'open' }))
+          .expect(200);
+
+        // remove any server generated items that are indeterministic
+        delete body.took;
+
+        expect(body).to.eql(getSignalStatusEmptyResponse());
+      });
+
+      it('should not give errors when querying and the signals index does exist and is empty', async () => {
+        await createSignalsIndex(supertest);
+        const { body } = await supertest
+          .post(DETECTION_ENGINE_SIGNALS_STATUS_URL)
+          .set('kbn-xsrf', 'true')
+          .send(setSignalStatus({ signalIds: ['123'], status: 'open' }))
+          .expect(200);
+
+        // remove any server generated items that are indeterministic
+        delete body.took;
+
+        expect(body).to.eql(getSignalStatusEmptyResponse());
+
+        await deleteSignalsIndex(supertest);
+      });
+    });
+  });
+};

x-pack/test/detection_engine_api_integration/security_and_spaces/tests/query_signals.ts

@@ -0,0 +1,60 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import expect from '@kbn/expect';
+
+import { DETECTION_ENGINE_QUERY_SIGNALS_URL } from '../../../../legacy/plugins/siem/common/constants';
+import { FtrProviderContext } from '../../common/ftr_provider_context';
+import { getSignalStatus, createSignalsIndex, deleteSignalsIndex } from './utils';
+
+// eslint-disable-next-line import/no-default-export
+export default ({ getService }: FtrProviderContext) => {
+  const supertest = getService('supertest');
+
+  describe('query_signals_route', () => {
+    describe('validation checks', () => {
+      it('should not give errors when querying and the signals index does not exist yet', async () => {
+        const { body } = await supertest
+          .post(DETECTION_ENGINE_QUERY_SIGNALS_URL)
+          .set('kbn-xsrf', 'true')
+          .send(getSignalStatus())
+          .expect(200);
+
+        // remove any server generated items that are indeterministic
+        delete body.took;
+
+        expect(body).to.eql({
+          timed_out: false,
+          _shards: { total: 0, successful: 0, skipped: 0, failed: 0 },
+          hits: { total: { value: 0, relation: 'eq' }, max_score: 0, hits: [] },
+        });
+      });
+
+      it('should not give errors when querying and the signals index does exist and is empty', async () => {
+        await createSignalsIndex(supertest);
+        const { body } = await supertest
+          .post(DETECTION_ENGINE_QUERY_SIGNALS_URL)
+          .set('kbn-xsrf', 'true')
+          .send(getSignalStatus())
+          .expect(200);
+
+        // remove any server generated items that are indeterministic
+        delete body.took;
+
+        expect(body).to.eql({
+          timed_out: false,
+          _shards: { total: 1, successful: 1, skipped: 0, failed: 0 },
+          hits: { total: { value: 0, relation: 'eq' }, max_score: null, hits: [] },
+          aggregations: {
+            statuses: { doc_count_error_upper_bound: 0, sum_other_doc_count: 0, buckets: [] },
+          },
+        });
+
+        await deleteSignalsIndex(supertest);
+      });
+    });
+  });
+};

x-pack/test/detection_engine_api_integration/security_and_spaces/tests/utils.ts

@@ -53,6 +53,36 @@ export const getSimpleRule = (ruleId = 'rule-1'): Partial<OutputRuleAlertRest> =
   query: 'user.name: root or user.name: admin',
 });
 
+export const getSignalStatus = () => ({
+  aggs: { statuses: { terms: { field: 'signal.status', size: 10 } } },
+});
+
+export const setSignalStatus = ({
+  signalIds,
+  status,
+}: {
+  signalIds: string[];
+  status: 'open' | 'closed';
+}) => ({
+  signal_ids: signalIds,
+  status,
+});
+
+export const getSignalStatusEmptyResponse = () => ({
+  timed_out: false,
+  total: 0,
+  updated: 0,
+  deleted: 0,
+  batches: 0,
+  version_conflicts: 0,
+  noops: 0,
+  retries: { bulk: 0, search: 0 },
+  throttled_millis: 0,
+  requests_per_second: -1,
+  throttled_until_millis: 0,
+  failures: [],
+});
+
 /**
  * This is a typical simple rule for testing that is easy for most basic testing
  */