manually disabling payload validation on the routes to fix for Kibana 7.6.0

[mmguero]

Fix issue #141 by manually disabling payload validation on the routes, as suggested in elastic/kibana#57777 (comment)

[nsano-rururu]

By incorporating this pull request, it will work with Kibana 7.6.0, 7.6.1, 7.6.2, 7.7.0, 7.7.1, 7.8.0.

[nsano-rururu]

When I tried to move it with Kibana 7.9.0 and Kibana 7.9.1 and Kibana 7.9.2, I also needed the following support.

error message

ERROR in ./plugins/elastalert-kibana-plugin/public/app.js
Module not found: Error: Can't resolve 'ui/autoload/styles' in '/usr/share/kibana/plugins/elastalert-kibana-plugin/public'

Workaround

public/app.js

delete 「import 'ui/autoload/styles';」

Frok Reporitory

nsano-rururu/elastalert-kibana-plugin
https://github.com/nsano-rururu/elastalert-kibana-plugin

Kibana startup log that I was interested in

The following warning appears when starting Kibana. With Kibana 7.9.0 or later,
it may not work unless you rewrite the program with the new writing method of Kibana Plugin.

{"type":"log","@timestamp":"2020-08-19T15:33:58Z","tags":["warning","legacy-service"],
"pid":6,"message":"Some installed third party plugin(s) [elastalert-kibana-plugin] 
are using the legacy plugin format and will no longer work in a future Kibana release. 
Please refer to https://ela.st/kibana-breaking-changes-8-0 for a list of breaking changes 
and https://ela.st/kibana-platform-migration for documentation on how to migrate legacy plugins."}

[nsano-rururu]

We've removed features used by legacy plugins from Kibana 7.10.0, so the version of Kibana supported by this pull request is up to 7.9.3.