Fix setup order in Elasticsearch docs
What does this MR do?
This is in response to #34558 (comment 261712479).
The ES index needs to be created before indexing is enabled, otherwise it can happen that the index gets auto-created on the first indexing action but is missing our mappings (#13717 (closed)).
Our current instructions are misleading in this regard, because we're enabling Elasticsearch indexing
before setting up the index (this was my fault in gitlab-foss!31972 (merged)
Author's checklist
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Follow the Documentation Guidelines and Style Guide. - [-] If applicable, update the permissions table.
- [-] Link docs to and from the higher-level index page, plus other related docs where helpful.
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Apply the documentation label.
Review checklist
All reviewers can help ensure accuracy, clarity, completeness, and adherence to the Documentation Guidelines and Style Guide.
1. Primary Reviewer
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Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.
2. Technical Writer
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Optional: Technical writer review. If not requested for this MR, must be scheduled post-merge. To request for this MR, assign the writer listed for the applicable DevOps stage.
3. Maintainer
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Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review. -
Ensure a release milestone is set. -
If there has not been a technical writer review, create an issue for one using the Doc Review template.
Edited by Dmitry Gruzd