grow_and_shrink_1.yaml

apiVersion: elasticsearch.k8s.elastic.co/v1alpha1
kind: Elasticsearch
metadata:
  name: elasticsearch-sample
spec:
  version: 7.2.0
  updateStrategy:
    changeBudget:
      maxUnavailable: 1
      maxSurge: 1
  nodes:
  - name: masters
    config:
      # most Elasticsearch configuration parameters are possible to set, e.g:
      node.attr.attr_name: attr_value
      node.master: true
      node.data: false
      node.ingest: false
      node.ml: false
    podTemplate:
      metadata:
        labels:
          # additional labels for pods
          foo: bar
      spec:
        containers:
        - name: elasticsearch
          # specify resource limits and requests
          resources:
            limits:
              memory: 4Gi
              cpu: 1
          env:
          - name: ES_JAVA_OPTS
            value: "-Xms2g -Xmx2g"
    nodeCount: 1
  - name: nodes
    config:
      # most Elasticsearch configuration parameters are possible to set, e.g:
      node.attr.attr_name: attr_value
      node.master: false
      node.data: true
      node.ingest: true
      node.ml: true
    podTemplate:
      metadata:
        labels:
          # additional labels for pods
          foo: bar
      spec:
        containers:
        - name: elasticsearch
          # specify resource limits and requests
          resources:
            limits:
              memory: 4Gi
              cpu: 2
          env:
          - name: ES_JAVA_OPTS
            value: "-Xms2g -Xmx2g"
    nodeCount: 5

grow_and_shrink_2.yaml

apiVersion: elasticsearch.k8s.elastic.co/v1alpha1
kind: Elasticsearch
metadata:
  name: elasticsearch-sample
spec:
  version: 7.2.0
  updateStrategy:
    changeBudget:
      maxUnavailable: 1
      maxSurge: 1
  nodes:
  - name: masters
    config:
      # most Elasticsearch configuration parameters are possible to set, e.g:
      node.attr.attr_name: attr_value
      node.master: true
      node.data: false
      node.ingest: false
      node.ml: false
    podTemplate:
      metadata:
        labels:
          # additional labels for pods
          foo: bar
      spec:
        containers:
        - name: elasticsearch
          # specify resource limits and requests
          resources:
            limits:
              memory: 4Gi
              cpu: 1
          env:
          - name: ES_JAVA_OPTS
            value: "-Xms2g -Xmx2g"
    nodeCount: 1
  - name: nodes-2
    config:
      # most Elasticsearch configuration parameters are possible to set, e.g:
      node.attr.attr_name: attr_value
      node.master: false
      node.data: true
      node.ingest: true
      node.ml: true
    podTemplate:
      metadata:
        labels:
          # additional labels for pods
          foo: bar
      spec:
        containers:
        - name: elasticsearch
          # specify resource limits and requests
          resources:
            limits:
              memory: 4Gi
              cpu: 2
          env:
          - name: ES_JAVA_OPTS
            value: "-Xms2g -Xmx2g"
    nodeCount: 3