return a 200 on health check

meilisearch-http/src/routes/health.rs

@@ -9,5 +9,6 @@ pub fn services(cfg: &mut web::ServiceConfig) {
 
 #[get("/health")]
 async fn get_health() -> Result<HttpResponse, ResponseError> {
-    Ok(HttpResponse::NoContent().finish())
+    let payload = serde_json::json!({ "status": "available" });
+    Ok(HttpResponse::Ok().body(payload.to_string()))
 }

meilisearch-http/tests/stats/mod.rs

@@ -10,3 +10,12 @@ async fn get_settings_unexisting_index() {
     assert!(version.get("buildDate").is_some());
     assert!(version.get("pkgVersion").is_some());
 }
+
+#[actix_rt::test]
+async fn test_healthyness() {
+    let server = Server::new().await;
+
+    let (response, status_code) = server.service.get("/health").await;
+    assert_eq!(status_code, 200);
+    assert_eq!(response["status"], "available");
+ }