POST
/api/timeline/_import
curl \
--request POST 'http://localhost:5601/api/timeline/_import' \
--header "Authorization: $API_KEY" \
--header "Content-Type: application/json" \
--data '{"isImmutable":"true"}'
curl \
--request POST 'http://localhost:5601/api/timeline/_import' \
--header "Authorization: $API_KEY" \
--header "Content-Type: application/json" \
--data '{"isImmutable":"true"}'