Can you try with a timeout in the header like the following?
-H "grpc-timeout: 30S"
Also, I notice that you have set lambda to 1 which indicates that you are looking for only keyword-based search results. Keyword-based search results are generally slower than neural search. We are working on improving those.
From the Console:
Lambda ranges from
0to1. At the extremes,0will execute a search based solely on neural search and1will execute a search based solely on keyword-based search. Values in the range of0.01to0.2seem to work well for many cases.