diff --git a/docker/test/upgrade/run.sh b/docker/test/upgrade/run.sh
index 0b30ab9dbf7..886efe3ff33 100644
--- a/docker/test/upgrade/run.sh
+++ b/docker/test/upgrade/run.sh
@@ -60,6 +60,12 @@ install_packages previous_release_package_folder
 # available for dump via clickhouse-local
 configure
 
+# async_replication setting doesn't exist on some older versions
+sudo cat /etc/clickhouse-server/config.d/keeper_port.xml \
+  | sed "/<async_replication>1<\/async_replication>/d" \
+  > /etc/clickhouse-server/config.d/keeper_port.xml.tmp
+sudo mv /etc/clickhouse-server/config.d/keeper_port.xml.tmp /etc/clickhouse-server/config.d/keeper_port.xml
+
 # it contains some new settings, but we can safely remove it
 rm /etc/clickhouse-server/config.d/merge_tree.xml
 rm /etc/clickhouse-server/config.d/enable_wait_for_shutdown_replicated_tables.xml
@@ -82,6 +88,12 @@ sudo cat /etc/clickhouse-server/config.d/keeper_port.xml \
   > /etc/clickhouse-server/config.d/keeper_port.xml.tmp
 sudo mv /etc/clickhouse-server/config.d/keeper_port.xml.tmp /etc/clickhouse-server/config.d/keeper_port.xml
 
+# async_replication setting doesn't exist on some older versions
+sudo cat /etc/clickhouse-server/config.d/keeper_port.xml \
+  | sed "/<async_replication>1<\/async_replication>/d" \
+  > /etc/clickhouse-server/config.d/keeper_port.xml.tmp
+sudo mv /etc/clickhouse-server/config.d/keeper_port.xml.tmp /etc/clickhouse-server/config.d/keeper_port.xml
+
 # But we still need default disk because some tables loaded only into it
 sudo cat /etc/clickhouse-server/config.d/s3_storage_policy_by_default.xml \
   | sed "s|<main><disk>s3</disk></main>|<main><disk>s3</disk></main><default><disk>default</disk></default>|" \
diff --git a/src/Coordination/Changelog.cpp b/src/Coordination/Changelog.cpp
index 2af68173588..7030775904c 100644
--- a/src/Coordination/Changelog.cpp
+++ b/src/Coordination/Changelog.cpp
@@ -1021,7 +1021,7 @@ void Changelog::writeThread()
 
     const auto flush_logs = [&](const auto & flush)
     {
-        LOG_TRACE(log, "Flushing {} logs", pending_appends);
+        LOG_TEST(log, "Flushing {} logs", pending_appends);
 
         {
             std::lock_guard writer_lock(writer_mutex);
diff --git a/src/Coordination/CoordinationSettings.cpp b/src/Coordination/CoordinationSettings.cpp
index aadedf19204..8688f6f5a40 100644
--- a/src/Coordination/CoordinationSettings.cpp
+++ b/src/Coordination/CoordinationSettings.cpp
@@ -22,16 +22,19 @@ void CoordinationSettings::loadFromConfig(const String & config_elem, const Poco
     Poco::Util::AbstractConfiguration::Keys config_keys;
     config.keys(config_elem, config_keys);
 
-    try
+    for (const String & key : config_keys)
     {
-        for (const String & key : config_keys)
+        try
+        {
             set(key, config.getString(config_elem + "." + key));
-    }
-    catch (Exception & e)
-    {
-        if (e.code() == ErrorCodes::UNKNOWN_SETTING)
-            e.addMessage("in Coordination settings config");
-        throw;
+        }
+        catch (Exception & e)
+        {
+            if (e.code() == ErrorCodes::UNKNOWN_SETTING)
+                LOG_WARNING(&Poco::Logger::get("CoordinationSettings"), "Found unknown coordination setting in config: '{}'", key);
+            else
+                throw;
+        }
     }
 }
 
@@ -134,6 +137,8 @@ void KeeperConfigurationAndSettings::dump(WriteBufferFromOwnString & buf) const
     write_int(coordination_settings->max_requests_batch_size);
     writeText("max_requests_batch_bytes_size=", buf);
     write_int(coordination_settings->max_requests_batch_bytes_size);
+    writeText("max_flush_batch_size=", buf);
+    write_int(coordination_settings->max_flush_batch_size);
     writeText("max_request_queue_size=", buf);
     write_int(coordination_settings->max_request_queue_size);
     writeText("max_requests_quick_batch_size=", buf);
diff --git a/tests/integration/helpers/cluster.py b/tests/integration/helpers/cluster.py
index 1e92bdaa788..7ee86d74d35 100644
--- a/tests/integration/helpers/cluster.py
+++ b/tests/integration/helpers/cluster.py
@@ -4260,9 +4260,10 @@ class ClickHouseInstance:
         if len(self.custom_dictionaries_paths):
             write_embedded_config("0_common_enable_dictionaries.xml", self.config_d_dir)
 
-        write_embedded_config(
-            "0_common_enable_keeper_async_replication.xml", self.config_d_dir
-        )
+        if self.tag == "latest":
+            write_embedded_config(
+                "0_common_enable_keeper_async_replication.xml", self.config_d_dir
+            )
 
         logging.debug("Generate and write macros file")
         macros = self.macros.copy()
diff --git a/tests/integration/test_keeper_four_word_command/test.py b/tests/integration/test_keeper_four_word_command/test.py
index 1d5bc6a6541..0de7de8c3be 100644
--- a/tests/integration/test_keeper_four_word_command/test.py
+++ b/tests/integration/test_keeper_four_word_command/test.py
@@ -279,8 +279,9 @@ def test_cmd_conf(started_cluster):
         assert result["stale_log_gap"] == "10000"
         assert result["fresh_log_gap"] == "200"
 
-        assert result["max_requests_batch_size"] == "100"
+        assert result["max_requests_batch_size"] == "1000"
         assert result["max_requests_batch_bytes_size"] == "102400"
+        assert result["max_flush_batch_size"] == "1000"
         assert result["max_request_queue_size"] == "100000"
         assert result["max_requests_quick_batch_size"] == "100"
         assert result["quorum_reads"] == "false"
@@ -290,6 +291,7 @@ def test_cmd_conf(started_cluster):
         assert result["compress_snapshots_with_zstd_format"] == "true"
         assert result["configuration_change_tries_count"] == "20"
 
+        assert result["async_replication"] == "true"
     finally:
         close_keeper_socket(client)