Regarding the NEW SEARCH EXPERIENCE:
1) Hub is no longer splitting Feature Service sublayers (Feature Layers) out as individual items that display as a search result.
2) When an end-user enters a search term for, or title of, a Feature Layer they receive an error message, "No results found."
We would prefer to have a search/discovery request for the Feature Layer, return the parent Feature Service.
For Example: When you click on the Feature Layer inside the Search Result of a parent Feature Service as is shown in the screenshot:
In summary:.
CLASSIC Search example: When searching on a multi-layer Feature Service, both the parent Feature Service, and the children Feature Layers are discoverable.
New EXPLORE Search example: Search doesn’t include Feature layers (sublayers). Now when searching for the Feature Layer, only Feature Services are discoverable, EXPLORE Search is not looking for Feature layers anymore, the sublayer cannot be found/discovered, where we think it used to return the Parent Feature Layer when first rolled out in Beta.