would it work for you to retrieve the document as part of the input and then save the whole document in the index action (and modify before saving), which basically is an update?
Another alternative might be to use the webhook action and call the update API yourself, even though that is a bit more of a hack it might work in your case.
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
logo are trademarks of the
Apache Software Foundation
in the United States and/or other countries.