[System] GA release for time_series index.mode

[tetianakravchenko]

What does this PR do?

Add a changelog record to the system package regarding the enablement of TSDB, add the doc regarding the time series index mode.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

Screenshots

[lalit-satapathy]

Approving since GA was already enabled. This does it cleanly now.

[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2023-06-21T10:03:03.309+0000

• Duration: 14 min 59 sec

Steps errors

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Test integration: system

• Took 1 min 35 sec . View more details here
• Description: eval "$(../../build/elastic-package stack shellinit)" ../../build/elastic-package test -v --report-format xUnit --report-output file --test-coverage

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	5.882% (1/17)	👎 -94.118
Lines	100.0% (0/0)	💚 7.839
Conditionals	100.0% (0/0)	💚

[tetianakravchenko]

/test

[tetianakravchenko]

/test

[tetianakravchenko]

/test

[tetianakravchenko]

FYI: tests are failing with the error:

Error: error running package system tests: could not complete test run: failed to tear down runner: failed to uninstall package: can't remove the package: could not remove package; API status code = 400; response body = {"statusCode":400,"error":"Bad Request","message":"unable to remove package with existing package policy(s) in use by agent(s)"}

fix - elastic/elastic-package#1315, waiting for the next elastic-package release

[mrodm]

Merging this PR.

This failure is related to an issue solved by this elastic-package PR elastic/elastic-package#1315 . It was also checked that tests for this package are run successfully with a previous version of elastic-package

cc @tetianakravchenko

[elasticmachine]

Package system - 1.34.0 containing this change is available at https://epr.elastic.co/search?package=system