Failing ES Promotion: Reporting APIs ILM policy migration APIs detects when no migration is needed

[mistic]

This failure is preventing the promotion of the current Elasticsearch nightly snapshot.

For more information on the Elasticsearch snapshot promotion process including how to reproduce using the unverified nightly ES build: https://www.elastic.co/guide/en/kibana/master/development-es-snapshots.html

CI failure logs: https://kibana-ci.elastic.co/job/elasticsearch+snapshots+verify/3318/testReport/junit/X-Pack%20Reporting%20API%20Integration%20Tests/x-pack_test_reporting_api_integration_reporting_and_security_ilm_migration_apis%C2%B7ts/Kibana_Pipeline___Reporting_APIs_ILM_policy_migration_APIs_detects_when_no_migration_is_needed/

Error: expected 200 "OK", got 404 "Not Found"
    at Test._assertStatus (/dev/shm/workspace/parallel/4/kibana/node_modules/supertest/lib/test.js:268:12)
    at Test._assertFunction (/dev/shm/workspace/parallel/4/kibana/node_modules/supertest/lib/test.js:283:11)
    at Test.assert (/dev/shm/workspace/parallel/4/kibana/node_modules/supertest/lib/test.js:173:18)
    at assert (/dev/shm/workspace/parallel/4/kibana/node_modules/supertest/lib/test.js:131:12)
    at /dev/shm/workspace/parallel/4/kibana/node_modules/supertest/lib/test.js:128:5
    at Test.Request.callback (/dev/shm/workspace/parallel/4/kibana/node_modules/supertest/node_modules/superagent/lib/node/index.js:718:3)
    at /dev/shm/workspace/parallel/4/kibana/node_modules/supertest/node_modules/superagent/lib/node/index.js:906:18
    at IncomingMessage.<anonymous> (/dev/shm/workspace/parallel/4/kibana/node_modules/supertest/node_modules/superagent/lib/node/parsers/json.js:19:7)
    at endReadableNT (internal/streams/readable.js:1317:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)

[elasticmachine]

Pinging @elastic/kibana-reporting-services (Team:Reporting Services)

[mistic]

Skipped.

master/8.0: 443979f

[tsullivan]

I took a bit of a look today, but could not figure out why the 404 is appearing.

@jloleysens would you mind checking this one out?

[jloleysens]

@tsullivan yeah, I'll take a look!