An error occurred after the data source was changed to Kafka using the Vector Agent service installed at helm

[king5211]

I found a very strange problem and need your help.
Vector installed using helm
helm install vector vector/vector --namespace vector --create-namespace
After the installation is complete, change the data source to Kafka, sink to Loki, and configMap as follows:

data:
   vector.yaml: |
     data_dir: /vector-data-dir
     api:
       enabled: true
       address: 127.0.0.1:8686
       playground: false
     sources:
       kafka:
         type: kafka
         acknowledgements: null
         bootstrap_servers: kafka-0.kafka-svc.default.svc.cluster.local:9092,kafka-1.kafka-svc.default.svc.cluster.local:9092,kafka-2.kafka-svc.default.svc.cluster.local:9092
         group_id: consumer-group-name-ventor
         topics:
          - ^(kube)-.+
     sinks:
       loki:
         type: loki
         inputs: [kafka]
         endpoint: loki.loki-stack.svc.cluster.local:3100
kind: ConfigMap
metadata:
   annotations:
     meta.helm.sh/release-name: vector
     meta.helm.sh/release-namespace: vector
   labels:
     app.kubernetes.io/component: Agent
     app.kubernetes.io/instance: vector
     app.kubernetes.io/managed-by: Helm
     app.kubernetes.io/name: vector
     app.kubernetes.io/version: 0.20.0-distroless-libc
     helm.sh/chart: vector-0.6.0
   name: vector
   namespace: vector

Vector-0 POD startup failed and error logs are as follows:

2022-03-07T02:15:42.131211Z  INFO vector::app: Loading configs. paths=["/etc/vector"]
2022-03-07T02:15:42.133246Z ERROR vector::cli: Configuration error. error=sources.kafka: invalid type: unit value, expected bool or map at line 8 column 9

[jszwedko]

Responded to this over here: #11706 (comment)