Appears in version 3.5.3 to 3.5.4
PanelTools --panelcheck command will fail to find the search service when performing a web server health check. The probe looks for SoftwareIDM.Elastic instead of SoftwareIDM.ElasticSearch.
Edit Panel Tools config.json to disable the SearchIndex Panel Check probe. This may be re-enabled after upgrading to a version newer than 3.5.4.
Fixed in version 4.1.0