public com.google.cloud.vmwareengine.v1.NodeTypeConfig.Builder
        putNodeTypeConfigsBuilderIfAbsent(java.lang.String key) {
      java.util.Map<java.lang.String, com.google.cloud.vmwareengine.v1.NodeTypeConfigOrBuilder>
          builderMap = internalGetMutableNodeTypeConfigs().ensureBuilderMap();
      com.google.cloud.vmwareengine.v1.NodeTypeConfigOrBuilder entry = builderMap.get(key);
      if (entry == null) {
        entry = com.google.cloud.vmwareengine.v1.NodeTypeConfig.newBuilder();
        builderMap.put(key, entry);
      }
      if (entry instanceof com.google.cloud.vmwareengine.v1.NodeTypeConfig) {
        entry = ((com.google.cloud.vmwareengine.v1.NodeTypeConfig) entry).toBuilder();
        builderMap.put(key, entry);
      }
      return (com.google.cloud.vmwareengine.v1.NodeTypeConfig.Builder) entry;
    }
<pre>
Required. The map of cluster node types in this cluster, where the key is
canonical identifier of the node type (corresponds to the `NodeType`).
</pre>

<code>
map&lt;string, .google.cloud.vmwareengine.v1.NodeTypeConfig&gt; node_type_configs = 16 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/Cluster.java