[Minor] Elastic: Switch off coroutines as they are unstable

src/plugins/lua/elastic.lua

@@ -79,12 +79,30 @@ local function elastic_send_data(task)
 
   local push_url = connect_prefix .. ip_addr .. '/'..es_index..'/_bulk'
   local bulk_json = table.concat(tbl, "\n")
-  local err, response = rspamd_http.request({
+
+  local function http_callback(err, code, _, _)
+    if err then
+      rspamd_logger.infox(task, "cannot push data to elastic backend (%s): %s; failed attempts: %s/%s",
+          push_url, err, failed_sends, settings.max_fail)
+    else
+      if code ~= 200 then
+        rspamd_logger.infox(task,
+            "cannot push data to elastic backend (%s): wrong http code %s (%s); failed attempts: %s/%s",
+            push_url, err, code, failed_sends, settings.max_fail)
+      else
+        lua_util.debugm(N, task, "successfully sent %s (%s bytes) rows to ES",
+            nrows, #bulk_json)
+      end
+    end
+  end
+
+  rspamd_http.request({
     url = push_url,
     headers = {
       ['Content-Type'] = 'application/x-ndjson',
     },
     body = bulk_json,
+    callback = http_callback,
     task = task,
     method = 'post',
     gzip = settings.use_gzip,
@@ -93,24 +111,6 @@ local function elastic_send_data(task)
     password = settings.password,
     timeout = settings.timeout,
   })
-
-  if err then
-    rspamd_logger.infox(task, "cannot push data to elastic backend (%s): %s; failed attempts: %s/%s",
-        push_url, err, failed_sends, settings.max_fail)
-  else
-    if response.code ~= 200 then
-      rspamd_logger.infox(task,
-          "cannot push data to elastic backend (%s): wrong http code %s (%s); failed attempts: %s/%s",
-          push_url, err, response.code, failed_sends, settings.max_fail)
-    else
-      lua_util.debugm(N, task, "successfully sent %s (%s bytes) rows to ES",
-          nrows, #bulk_json)
-
-      return true
-    end
-  end
-
-  return false
 end
 
 local function get_general_metadata(task)