Set proper value for constant keyword in transform

[jsoriano]

Fix value of labels.is_ioc_transform_source, a constant keyword that has a different value in the source index.

See elastic/elastic-package#2218 (comment)

[elastic-vault-github-plugin-prod]

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[elasticmachine]

💚 Build Succeeded

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• Commit: bf592dd

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• 💚 Build #18358 succeeded 11cdafa
• 💔 Build #18357 failed 8eb977b

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

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0.0% Duplication on New Code

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[botelastic]

Hi! We just realized that we haven't looked into this PR in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!