Added scripted_metric in Visualize

[f1ren]

Adapted the changes made by @fabiangebert in #2646 into Kibana 4.3

[elasticsearch-release]

Jenkins standing by to test this. If you aren't a maintainer, you can ignore this comment. Someone with commit access, please review this and clear it for Jenkins to run; then say 'jenkins, test it'.

[spalger]

Is there a way for this to work with Lucene expressions? I'm getting an exception when using it with a default elasticsearch install because groovy scripting is disabled

[AlexIoannides]

Looking forward to this :-)

[fabiangebert]

I implemented it for scripted_metric aggregation. We use it with Groovy. However, I guess you can switch to a different scripting language.

[spalger]

Unless we can find a way to make this work with lucene expressions then we won't be able to merge this. Sorry. Perhaps once elastic/elasticsearch#13084 lands we can revist this.

[JeremyColton]

This seems like the only way to provide a metric visual of a ratio calculation. When will this feature be added? Having a ratio is the bare minimum of every analytics dashboard. My company is considering abandoning Kibana based on this limitation.

[AlexIoannides]

@JeremyColton We've developed a simple visualisation plug-in that does the multiplication and division of aggregations using basic JS in the UI. It's a bit too rough to release as a standalone plugin just yet, but it has proved a good work-around for achieving this basic functionality.

[JeremyColton]

Hi @Alexloannides, awesome! When do you think it will be available?

[AlexIoannides]

Can't say just yet...

[JeremyColton]

@AlexIoannides anything is better than nothing :) ...

[JeremyColton]

@AlexIoannides hi, any update on your super needed plug-in? many thanks...