OpenSearch Dashboards health status red, everything else green

We have an OpenSearch domain here on AWS.

Sometimes Cluster status and OpenSearch Dashboards health status goes into yellow for a few minutes which is fine I guess.

But yesterday OpenSearch Dashboards health status went into red and is there still. Everything else works except the dashboards, which gives error 503: {"Message":"Http request timed out connecting"}

{
  "cluster_name" : "779754160511:telemetry",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 2,
  "number_of_data_nodes" : 2,
  "discovered_master" : true,
  "discovered_cluster_manager" : true,
  "active_primary_shards" : 166,
  "active_shards" : 332,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 0,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 100.0
}

I tried triggering blue/green deployment which didn't help.

How could I solve this? Is there a way to restart the domain or debug in someway?