[Lens] An error page is displayed when you manually erase out the fields on the X/Y axis which could be improvized.

[rashmivkulkarni]

Kibana version: found in 7.10

Elasticsearch version: 7.10

On Lens visualization, when you clear the the Y axis fields manually ( not reset the layer) , it shows an error stating

An error occurred when loading data.

Show details of error
[lens_merge_tables] > [esaggs] > Cannot read property 'forEach' of undefined

This could be improvised - either show a more user-friendly error or bring the user back to start where you drag and drop the fields.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[dej611]

This has been fixed since 7.11: #81439

[flash1293]

The behavior for this specific case got slightly better in 7.11 but it's not fixed. Right now this happens:

• "No results" is shown
• Dimension doesn't have a label
• Config flyout can't be opened anymore once it's closed (still possible to recover by deleting the dimension and starting over)

I suggest we don't even allow clearing out the field, I can't think of a good reason a user would want to do this.

[dej611]

Oh I didn't notice the field was white. It could be probably be handled by the same validation logic in 7.11

[flash1293]

@dej611 I guess it would be possible, but I don't really see a good reason (see the last sentence below the screenshot in my previous comment):

I suggest we don't even allow clearing out the field, I can't think of a good reason a user would want to do this.

[wylieconlon]

I've opened a related EUI bug for this, because it seems like part of the issue is that you are allowed to press the delete key: elastic/eui#4394

[dej611]

Partially mitigated by #98295

[flash1293]

This isn't possible anymore in current version of Lens