[Security Solution][Endpoint] Fix generator so that the --fleet opt…

…ion creates a fake agent with fleet (elastic#99942) (elastic#99992)

* new fleet agent generator
* Indexing of generated data changed to index fake fleet server agents

Co-authored-by: Paul Tavares <56442535+paul-tavares@users.noreply.github.com>

x-pack/plugins/security_solution/common/endpoint/data_generators/fleet_agent_generator.ts

@@ -0,0 +1,116 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { estypes } from '@elastic/elasticsearch';
+import { DeepPartial } from 'utility-types';
+import { merge } from 'lodash';
+import { BaseDataGenerator } from './base_data_generator';
+import { Agent, AGENTS_INDEX, FleetServerAgent } from '../../../../fleet/common';
+
+export class FleetAgentGenerator extends BaseDataGenerator<Agent> {
+  /**
+   * @param [overrides] any partial value to the full Agent record
+   *
+   * @example
+   *
+   * fleetAgentGenerator.generate({
+   *  local_metadata: {
+   *    elastic: {
+   *      agent: {
+   *        log_level: `debug`
+   *      }
+   *    }
+   *  }
+   *  });
+   */
+  generate(overrides: DeepPartial<Agent> = {}): Agent {
+    const hit = this.generateEsHit();
+
+    // The mapping below is identical to `searchHitToAgent()` located in
+    // `x-pack/plugins/fleet/server/services/agents/helpers.ts:19`
+    return merge(
+      {
+        // Casting here is needed because several of the attributes in `FleetServerAgent` are
+        // defined as optional, but required in `Agent` type.
+        ...(hit._source as Agent),
+        id: hit._id,
+        policy_revision: hit._source?.policy_revision_idx,
+        access_api_key: undefined,
+        status: undefined,
+        packages: hit._source?.packages ?? [],
+      },
+      overrides
+    );
+  }
+
+  /**
+   * @param [overrides] any partial value to the full document
+   */
+  generateEsHit(
+    overrides: DeepPartial<estypes.Hit<FleetServerAgent>> = {}
+  ): estypes.Hit<FleetServerAgent> {
+    const hostname = this.randomHostname();
+    const now = new Date().toISOString();
+    const osFamily = this.randomOSFamily();
+
+    return merge<estypes.Hit<FleetServerAgent>, DeepPartial<estypes.Hit<FleetServerAgent>>>(
+      {
+        _index: AGENTS_INDEX,
+        _id: this.randomUUID(),
+        _score: 1.0,
+        _source: {
+          access_api_key_id: 'jY3dWnkBj1tiuAw9pAmq',
+          action_seq_no: -1,
+          active: true,
+          enrolled_at: now,
+          local_metadata: {
+            elastic: {
+              agent: {
+                'build.original': `8.0.0-SNAPSHOT (build: ${this.randomString(
+                  5
+                )} at 2021-05-07 18:42:49 +0000 UTC)`,
+                id: this.randomUUID(),
+                log_level: 'info',
+                snapshot: true,
+                upgradeable: true,
+                version: '8.0.0',
+              },
+            },
+            host: {
+              architecture: 'x86_64',
+              hostname,
+              id: this.randomUUID(),
+              ip: [this.randomIP()],
+              mac: [this.randomMac()],
+              name: hostname,
+            },
+            os: {
+              family: osFamily,
+              full: `${osFamily} 2019 Datacenter`,
+              kernel: '10.0.17763.1879 (Build.160101.0800)',
+              name: `${osFamily} Server 2019 Datacenter`,
+              platform: osFamily,
+              version: this.randomVersion(),
+            },
+          },
+          user_provided_metadata: {},
+          policy_id: this.randomUUID(),
+          type: 'PERMANENT',
+          default_api_key: 'so3dWnkBj1tiuAw9yAm3:t7jNlnPnR6azEI_YpXuBXQ',
+          // policy_output_permissions_hash:
+          //   '81b3d070dddec145fafcbdfb6f22888495a12edc31881f6b0511fa10de66daa7',
+          default_api_key_id: 'so3dWnkBj1tiuAw9yAm3',
+          updated_at: now,
+          last_checkin: now,
+          policy_revision_idx: 2,
+          policy_coordinator_idx: 1,
+        },
+      },
+      overrides
+    );
+  }
+}