Hi,
Thank you for waiting, while I performed some tests.
I'm happy to confirm that it is possible to index the fields in a repeating field group, through Relevanssi and here are the steps:
1. Suppose that you have a post type "Project" and it has a repeating field group "Project RFG" attached to it.
2. From the field group settings screen, you'll check the option "Include this field in text searches throughout the site" for all the fields which you'd like to be indexed.
( screenshot: hidden link )
3. Next, please go to WP Admin -> Toolset -> Settings -> Text Search and select all the fields which you'd like to be indexed and copy their slugs from the field below.
( screenshot: hidden link )
4. Now, go to WP Admin -> Settings -> Relevanssi -> Indexing and make sure that both the parent Project and its child Project RFG post types are selected.
( screenshot: hidden link )
5. On the same page, you'll select "some" for the "Custom fields" option and paste the slug of the copied custom fields from step 3 and then use the "Build the index" button on the top, to regenerate the search index.
( screenshot: hidden link )
6. In post view that you'll use for the search, you'll select both post types; "Project" and "Project RFG".
( screenshot: hidden link )
Important note: The search results will now include hidden "Project RFG" posts too, so to show your content in the loop item in a more meaningful way, you'll need to distinguish which type of post type is being shown and then show the required data accordingly.
[wpv-conditional if="( '[wpv-post-type]' eq 'project' )"]
Show this content if post type is Project
Title: [wpv-post-title]
[/wpv-conditional]
[wpv-conditional if="( '[wpv-post-type]' eq 'project-rfg' )"]
Show this content if post type is Project RFG
Title: [wpv-post-title item="@project-rfg.parent"]
[/wpv-conditional]
You can learn more about using conditional blocks and "item" attribute, from these guides:
https://toolset.com/documentation/user-guides/conditional-html-output-in-views/
https://toolset.com/documentation/user-guides/views-shortcodes/item-attribute/
I hope this helps and please let me know if you need any further assistance around this.
regards,
Waqar