Preserve order of suggestions search results (#2065)

Use ordered list (`toList`), not unordered set (`toSet`)

web/app/controllers/resources/Application.java

@@ -394,7 +394,7 @@ private static JsonNode toSuggestions(JsonNode json, String field) {
 								: typeText));
 			});
 		});
-		return Json.toJson(suggestions.collect(Collectors.toSet()));
+		return Json.toJson(suggestions.collect(Collectors.toList()));
 	}
 
 	private static Stream<JsonNode> fieldValues(String field, JsonNode document) {