Fix cluster reindexing service preflight check

What does this MR do and why?

This MR fixes #431358 (closed), specifically, Elastic::ClusterReindexingService.

Instead of always calculating storage requirements for all indices, we're going to do that only for selected targets.

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added bugfunctional devopsdata stores groupglobal search sectioncore platform typebug + 1 deleted label

requested review from @sdungarwal

assigned to @dgruzd

changed milestone to %16.7

added backend label

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Category	Reviewer	Maintainer
backend	@eduardobonet (UTC+1, same timezone as author)	@cablett (UTC+13, 12 hours ahead of author)

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Generated by Danger

@sdungarwal Could I ask you to act as an initial reviewer here and assign it to @maddievn if everything's ok? Thank you!

added 407 commits

• 8852f53f...79fb5ee7 - 406 commits from branch master
• d0e76ca1 - Fix cluster reindexing preflight check

Compare with previous version

Allure report

allure-report-publisher generated test report!

e2e-test-on-gdk: test report for be61bd22

expand test summary

+-----------------------------------------------------------------------+
|                            suites summary                             |
+------------------+--------+--------+---------+-------+-------+--------+
|                  | passed | failed | skipped | flaky | total | result |
+------------------+--------+--------+---------+-------+-------+--------+
| Data Stores      | 23     | 0      | 0       | 0     | 23    | ✅     |
| Plan             | 55     | 0      | 0       | 0     | 55    | ✅     |
| Manage           | 0      | 0      | 1       | 0     | 1     | ➖     |
| Create           | 48     | 0      | 9       | 0     | 57    | ✅     |
| Verify           | 31     | 0      | 0       | 0     | 31    | ✅     |
| Govern           | 57     | 0      | 0       | 0     | 57    | ✅     |
| Monitor          | 8      | 0      | 0       | 0     | 8     | ✅     |
| Framework sanity | 0      | 0      | 1       | 0     | 1     | ➖     |
| Package          | 0      | 0      | 1       | 0     | 1     | ➖     |
+------------------+--------+--------+---------+-------+-------+--------+
| Total            | 222    | 0      | 12      | 0     | 234   | ✅     |
+------------------+--------+--------+---------+-------+-------+--------+

approved this merge request

@sdungarwal, thanks for approving this merge request.

This is the first time the merge request has been approved. To ensure we don't only run predictive pipelines, and we don't break master, a new pipeline will be started shortly.

Please wait for the pipeline to start before resolving this discussion and set auto-merge for the new pipeline. See merging a merge request for more details.

added pipeline:mr-approved label

requested review from @maddievn and removed review request for @sdungarwal

mentioned in merge request !138060 (merged)

approved this merge request

added 485 commits

• d0e76ca1...a3d87a08 - 484 commits from branch master
• be61bd22 - Fix cluster reindexing preflight check

Compare with previous version

resolved all threads

enabled an automatic merge when the pipeline for 25f7cdba succeeds

merged

mentioned in commit 532a65fa