Vertex AI Agent Builder completeQuery API returning empty array suggestions

[corwyn]

Hi, 

I'm trying to use the datastores.completeQuery method for Vertex AI Agent Builder but I'm not receiving any autocomplete suggestions, it just returns an empty array despite having used SearchService.Search method and having the data ingested more than 2 days prior already. The data ingested is unstructured and I've done ingestion via the jsonl file method from Cloud Storage using structData.

I've tried using document, search-history, user-event as the queryModel but I'm still getting the following response from completeQuery method:

[ { querySuggestions: [], tailMatchTriggered: false }, null, null ]

 I'm expecting the querySuggestions array to have autocomplete string values from the prompt.