Refusing to connect to Elasticsearch-Node with expired certificate

Error: Enterprise Search is unable to connect to Elasticsearch. Ensure a healthy Elasticsearch cluster is running at for user elastic.

But I can confirm that everything is fine:

[root@v220191183186100843 ~]# curl -k -u elastic
Enter host password for user 'elastic':
"name" : "v220191183186100843",
"cluster_name" : "Das Asoziale Netzwerk",
"cluster_uuid" : "6P8H_FsPQ2Kz6pzqWlj4EA",
"version" : {
"number" : "7.9.2",
"build_flavor" : "default",
"build_type" : "rpm",
"build_hash" : "d34da0ea4a966c4e49417f2da2f244e3e97b4e6e",
"build_date" : "2020-09-23T00:45:33.626720Z",
"build_snapshot" : false,
"lucene_version" : "8.6.2",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
"tagline" : "You Know, for Search"

It worked before.
The only thing that changed, was my certificate expiring, but it wasn't ever valid for in the first place...

My config:
elasticsearch.username: elastic
elasticsearch.password: REDACTED
elasticsearch.ssl.enabled: true
elasticsearch.ssl.verify: false