2 containers created but there is only one such spec in Elasticsearch.yaml

I am using the following manifest to create my Elasticsearch resource.

I would expect that since for each set of nodes (master / data) I only have one container specification, only one of them would be created in each pod

apiVersion: elasticsearch.k8s.elastic.co/v1
kind: Elasticsearch
metadata:
  name: elasticsearch-sample
  namespace: eck-poc
spec:
  version: 7.11.0
  nodeSets:
  - name: master
    config:
      node.roles: ["master"]
      node.store.allow_mmap: false
    podTemplate:
      metadata:
        labels:
          env: eck-poc-master
      spec:
        containers:
        - name: elasticsearch-master
          image: docker.elastic.co/elasticsearch/elasticsearch:7.11.0
          # specify resource limits and requests
          resources:
            requests:
              memory: 2Gi
              cpu: 0.5
            limits:
              memory: 6Gi
              cpu: 1
          env:
          - name: ES_JAVA_OPTS
            value: "-Xms1g -Xmx1g"
    count: 3
    volumeClaimTemplates:
    - metadata:
        name: elasticsearch-data
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 20Gi
        storageClassName: standard
  - name: data
    config:
      node.roles: ["data"]
      node.store.allow_mmap: false
    podTemplate:
      metadata:
        labels:
          env: eck-poc-data
      spec:
        containers:
        - name: elasticsearch-data
          image: docker.elastic.co/elasticsearch/elasticsearch:7.11.0
          # specify resource limits and requests
          resources:
            requests:
              memory: 3Gi
              cpu: 1
            limits:
              memory: 6Gi
              cpu: 2
          env:
          - name: ES_JAVA_OPTS
            value: "-Xms2g -Xmx2g"
    count: 3
    volumeClaimTemplates:
    - metadata:
        name: elasticsearch-data
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 40Gi
        storageClassName: balanced-rwo

I see two containers in e.g. a data pod, one named name: elasticsearch-data and one named plain elasticsearch.

Is this the expected behavior?

Nevermind, apparently we should not mess with the container's name...