search_api-8.x-1.15/config/schema/search_api.server.schema.yml

search_api.server.*:
  type: config_entity
  label : 'Search server'
  mapping:
    id:
      type: string
      label: 'ID'
    name:
      type: label
      label: 'Name'
    description:
      type: text
      label: 'Description'
    status:
      type: boolean
      label: 'Status'
    backend:
      type: string
      label: 'Backend Plugin ID'
    backend_config:
      type: plugin.plugin_configuration.search_api_backend.[%parent.backend]
    langcode:
      type: string
      label: 'Language code'
    dependencies:
      type: config_dependencies
      label: 'Dependencies'

plugin.plugin_configuration.search_api_backend.*:
  type: mapping