Are the Kibana 4.1.1 dashboards compatible with previous versions of Kibana? I think the new charts aren't but what about the charts that use the same features as previous versions?
And, is the last version of Kibana compatible with elasticsearch 1.42 ?
I'm not exactly sure what you mean by backward-compatible in this context. We introduced ability to export and re-import Kibana 4 charts in Kibana 4.1. Given that 4.1.1 is a bugfix release, charts exported from that release should be compatible with Kibana 4.1. You cannot import them into 4.0, since that version doesn't have import functionality, and you can't import them into Kibana 3, since that version uses a completely different dashboard schema.
Product compatibility information can be found here: Support Matrix | Elastic
Kibana 4.0.x and 4.1.x are compatible with Elasticsearch 1.4.4+
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