Support for Kibana 7.12 or later in Docker installation (_src_plugins_vis_default_editor_public__WEBPACK_IMPORTED_MODULE_2__.Schemas is not a constructor)

[jtt0]

Hi, I'm trying to install kbn-radar in a docker image of kibana 7.12. I followed this steps:

1. I have downloaded release 7.10 and modified kibana.json to upgrade to 7.12. I have create a new release here to install plugins from url. I have tried installing from local files but I obtain the same error.
2. Dockerfile contains:

FROM docker.elastic.co/kibana/kibana:7.12.0
COPY kbn_radar-7.12.0.zip plugins/kbn_radar.zip
USER root
RUN /usr/share/kibana/bin/kibana-plugin install --timeout 5m https://github.com/jtt0/kbn_radar_7.12/releases/download/v2/kbn_radar-7.12.0.zip 
RUN /usr/share/kibana/bin/kibana --optimize --allow-root
RUN chown -R kibana:root /usr/share/kibana/plugins
USER kibana

Then, when I up docker image, I get this error:

_src_plugins_vis_default_editor_public__WEBPACK_IMPORTED_MODULE_2__.Schemas is not a constructor
Version: 7.12.0
Build: 39309
TypeError: _src_plugins_vis_default_editor_public__WEBPACK_IMPORTED_MODULE_2__.Schemas is not a constructor
    at kbnRadarVisTypeDefinition (http://localhost:5601/39309/bundles/plugin/kbnRadar/kbnRadar.plugin.js:21010:16)
    at KbnRadarPlugin.setup (http://localhost:5601/39309/bundles/plugin/kbnRadar/kbnRadar.plugin.js:21428:124)
    at plugin_PluginWrapper.setup (http://localhost:5601/39309/bundles/core/core.entry.js:13:198334)
    at plugins_service_PluginsService.setup (http://localhost:5601/39309/bundles/core/core.entry.js:13:202168)
    at async core_system_CoreSystem.setup (http://localhost:5601/39309/bundles/core/core.entry.js:13:276177)
    at async Module.__kbnBootstrap__ (http://localhost:5601/39309/bundles/core/core.entry.js:13:282300)

And kibana logs:

{"type":"log","@timestamp":"2021-05-26T15:51:50+00:00","tags":["error","plugins","taskManager"],"pid":7,"message":"Failed to poll for work: Error: work has timed out"}

I have tried everything that I can, for example:

1. I have tried to use the flag --timeout 5m.
2. Following this similar question of the error, I have tried to change this line import tableVisTemplate from './kbn-radar-vis.html'; with this import {tableVisTemplate} from './kbn-radar-vis.html';.

Thanks for your attention :)