public Embedder getEmbedder() {
            if (embedders.size() != 1) {
                throw new IllegalArgumentException("Attempt to get single embedder but multiple exists.");
            }
            return embedders.entrySet().stream().findFirst().get().getValue();
        }
Returns the query profile of this query, or null if none.
container-search/src/main/java/com/yahoo/search/Query.java