toolshed-8.x-1.x-dev/modules/toolshed_search/toolshed_search.routing.yml

toolshed_search.entity_autocomplete:
  path: /api/ts/entity-autocomplete/{view}/{display}/{filter_id}
  defaults:
    _controller: \Drupal\toolshed_search\Controller\SearchAutocomplete::entityAutocomplete
  requirements:
    _custom_access: \Drupal\toolshed_search\Controller\SearchAutocomplete::viewAccess
  options:
    parameters:
      view:
        type: entity:view
      display:
        type: string
      filter_id:
        type: string