[ML] Test failures bumping Elasticsearch to 7.12.0

[tylersmalley]

During the 7.12.0 bump on the 7.x branch we encountered two failures in the functional tests.

https://kibana-ci.elastic.co/job/elastic+kibana+pipeline-pull-request/94934/execution/node/664/log/

10:00:50                 └- ✖ fail: transform creation_index_pattern batch transform with terms+date_histogram groups and avg agg navigates through the wizard and sets all needed fields
10:00:50                 │      retry.tryForTime timeout: Error: Unique EuiDataGrid column values should be 'Men's Accessories' (got June 12th 2019, 03:51:00,June 12th 2019, 08:32:00,June 12th 2019, 09:08:00,June 12th 2019, 10:55:00,June 12th 2019, 12:14:00)

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https://kibana-ci.elastic.co/job/elastic+kibana+pipeline-pull-request/94934/execution/node/616/log/

10:07:37                     └- ✖ fail: apps transform basic license transform creation_index_pattern batch transform with terms+date_histogram groups and avg agg navigates through the wizard and sets all needed fields
10:07:37                     │      retry.tryForTime timeout: Error: Unique EuiDataGrid column values should be 'Men's Accessories' (got June 12th 2019, 03:51:00,June 12th 2019, 08:32:00,June 12th 2019, 09:08:00,June 12th 2019, 10:55:00,June 12th 2019, 12:14:00)

In order to unblock downstream teams and the rest of the stack building 7.x/7.12 I have disabled these tests in #86127 for the ML team to investigate.

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[tylersmalley]

cc @walterra and @pheyos

[darnautov]

hey @tylersmalley! We couldn't reproduce this issue with the latest master. Also verified it works as expected with the 7.11. Is it possible that there was a temp issue with the EUI data grid component?

[darnautov]

We found this bug in the recent elasticsearch build elastic/elasticsearch#66812 which affects the latest method preview (columns are rendered according to the preview mappings). I assume some of the previous builds contained an issue for the pivot preview.

[darnautov]

Re-enabled these tests in #88143