Add "dataset_is_prefix" field to data_stream, if present.

[skh]

This change exposes the new field dataset_is_prefix so that it can be used by Kibana/EPM.

The field was added to package-spec in elastic/package-spec#102

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: Pull request #674 updated

• • Start Time: 2021-01-26T14:43:00.809+0000

• Duration: 6 min 55 sec

• Commit: 679c06c

Test stats 🧪

Test	Results
Failed	0
Passed	169
Skipped	0
Total	169

Steps errors

Expand to view the steps failures

Installing golang.org/x/tools/cmd/goimports

• Took 0 min 1 sec . View more details on here
• Description: go get -u golang.org/x/tools/cmd/goimports

[ycombinator]

Hi @skh, could you try running mage format in the root folder?

[ycombinator]

Could you add a CHANGELOG entry for this change, please? Thanks!

https://github.com/elastic/package-registry/blob/master/CHANGELOG.md

[ycombinator]

LGTM.

[ruflin]

Would be nice to have a follow up adding this to one of the test packages: https://github.com/elastic/package-registry/tree/master/testdata/package Then we can see how the actual output looks.

[skh]

Would be nice to have a follow up adding this to one of the test packages

#676