magento/magento2#: Remove redundant use=“optional” from INDEXER XSD schema

[atwixfirster]

Description (*)

PR removes the redundant use=“optional” in the indexer.xsd. Regarding to https://www.w3.org/TR/xmlschema-1/ attribute use has a default optional value:

<xs:attribute name="use" use="optional" default="optional">

Also, PR removes the redundant spaces.

Fixed Issues (if relevant)

1. magento/magento2#<issue_number>: Issue title

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

Thank you!

[m2-assistant]

Hi @atwixfirster. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento give me test instance - deploy test instance based on PR changes
• @magento give me 2.3-develop instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Guide documentation.

[lbajsarowicz]

Nice catch, thanks for contribution @atwixfirster

[engcom-Bravo]

✔️ QA Passed

[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-6306 has been created to process this Pull Request

[m2-assistant]

Hi @atwixfirster, thank you for your contribution!
Please, complete Contribution Survey, it will take less than a minute.
Your feedback will help us to improve contribution process.