Hi,
Please note that repeater fields are not supported – every other ACF text based field is, exceptions are the repeaters, as those are not stored as textual values and those does not have any fixed content layout to parse. The only possible solution is that knowledge base article unfortunately.
The ACF API does not have a way to get all repeater field subfieds to index, because of that there is no way for us to integrate a permanent solution. There is also no way to list only the repeater fields, which makes it even harder.
Do you have by any chance a list of the fields to index, or do you simply vant to index all fields there are? Indexing all custom fields is not implemented on purpose, as parsing every custom field on a post can easily cause the index process to fail, as in some cases people have 1000s of fields per post, and PHP usually cannot handle that amount of data.
Maybe I can suggest a modification to that code to index everything, let me know if that is what you want to try.