D8WFC - Autocomplete Contact Element

For security reasons this autocomplete lookup only works for authenticated (logged-in) users. 

Contact 1
YAML
processed_text:
  '#type': processed_text
  '#text': "<p>For security reasons this autocomplete lookup only works for authenticated (logged-in) users.&nbsp;</p>\r\n"
  '#format': html
civicrm_1_contact_1_contact_existing:
  '#type': civicrm_contact
  '#title': 'Existing Contact'
  '#widget': autocomplete
  '#search_prompt': '- Choose existing -'
  '#none_prompt': '+ Create new +'
  '#results_display':
    display_name: display_name
  '#allow_url_autofill': false
  '#allow_create': 1
  '#contact_type': individual
  '#form_key': civicrm_1_contact_1_contact_existing
  '#extra': {  }
civicrm_1_contact_1_contact_first_name:
  '#type': textfield
  '#contact_type': individual
  '#form_key': civicrm_1_contact_1_contact_first_name
  '#extra':
    width: 20
  '#title': 'First Name'
civicrm_1_contact_1_contact_last_name:
  '#type': textfield
  '#contact_type': individual
  '#form_key': civicrm_1_contact_1_contact_last_name
  '#extra':
    width: 20
  '#title': 'Last Name'