.kuiLocalSearchInput has an invalid aria attribute value

[bhavyarm]

Kibana version: 6.3.0 BC6

Elasticsearch version: 6.3.0 BC6

Browser version: chrome latest

Browser OS version: OS X

Original install method (e.g. download page, yum, from source, etc.): from staging

Describe the bug: The search bar has an invalid aria attribute value(Axe help link)

[Bargs]

@timroes I think you added this attribute, I've got a question. The reason we're seeing this warning is that we moved the documentation link from the query bar to the opt-in popover that comes up when you click "Options" in the query bar. Even if I add the id back to the link, the element won't exist in the page until the user clicks that popover link. Do you know if there's any way to retain the relationship here?

[timroes]

It earlier was described by the "Using Lucene query syntax" label. Since that is gone and I don't think we currently have any other more detailed description on screen, I think you could just remove aria-describedby without any issues. So since the Popover is not in DOM until clicked there is also no way to point towards it.