So, I solved this problem by adding self-signed certificate in filebeat daemonset. Anyone who wants to add can do it by following steps. Mount path depends on OS in which your container is running, I am assuming ubuntu:

1. Create secret with following code :

    apiVersion: v1
    kind: Secret
    metadata:
      name: self-signed-certificate-secret
    data:
      ca-certificates.crt: <base 64 encoded string of certificate>
   

2. Then edit filebeat-kubernets.yaml file. In daemonset section add the following line:

   volumeMounts:
   - name: cert
     mountPath: /etc/ssl/certs

3. In volumes section add information related to volume mount cert:

   volumes:
   - name: cert
     secret:
     secretName: self-signed-certificate-secret
     defaultMode: 0400