[7.x] [SIEM][Detection Engine] Adds signal to ECS event.kind and fixes status in signals (#51772) #51786
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…us in signals (elastic#51772) ## Summary * Adds signal to the ECS event.kind when it copies over a signal * Creates a `original_event` if needed within signal so additional look ups don't have to happen * Fixes a bug with `signal.status` where it was not plumbed correctly * Adds extra unit tests around the filter * Adds missing unit tests around utils I didn't add before * Fixes a typing issue with output of a signal Example signal output: Original event turns into this: ```ts "event" : { "dataset" : "socket", "kind" : "signal", "action" : "existing_socket", "id" : "ffec6797-b92f-4436-bb40-69bac2c21874", "module" : "system" }, ``` Signal amplification turns into this where it contains original_event looks like this: ```ts "signal" : { "parent" : { "id" : "xNRlqW4BHe9nqdOi2358", "type" : "event", "index" : "auditbeat", "depth" : 1 }, "original_time" : "2019-11-26T20:27:11.169Z", "status" : "open", "rule" : { "id" : "643fbd2f-a3c9-449e-ba95-e3d89000a72a", "rule_id" : "rule-1", "false_positives" : [ ], "max_signals" : 100, "risk_score" : 1, "description" : "Detecting root and admin users", "from" : "now-6m", "immutable" : false, "interval" : "5m", "language" : "kuery", "name" : "Detect Root/Admin Users", "query" : "user.name: root or user.name: admin", "references" : [ "http://www.example.com", "https://ww.example.com" ], "severity" : "high", "tags" : [ ], "type" : "query", "to" : "now", "enabled" : true, "created_by" : "elastic_some_user", "updated_by" : "elastic_some_user" }, "original_event" : { "dataset" : "socket", "kind" : "state", "action" : "existing_socket", "id" : "ffec6797-b92f-4436-bb40-69bac2c21874", "module" : "system" } } ``` ### Checklist Use ~~strikethroughs~~ to remove checklist items you don't feel are applicable to this PR. ~~- [ ] This was checked for cross-browser compatibility, [including a check against IE11](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility)~~ ~~- [ ] 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~~ - [x] [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)~~ ### 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] This includes a feature addition or change that requires a release note and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)
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Backports the following commits to 7.x: