When configuring the chart, you should not include this.
That is, `--set some.field=true` should be passed, not `--set defaults.some.field=true`.

### Examples

#### Configuring mesh configuration settings

Any [Mesh Config](https://istio.io/latest/docs/reference/config/istio.mesh.v1alpha1/) options can be configured like below:

```yaml
meshConfig:
  accessLogFile: /dev/stdout
```

#### Revisions

data:

  # Configuration file for the mesh networks to be used by the Split Horizon EDS.
  meshNetworks: |-
  {{- if .Values.global.meshNetworks }}
    networks:
{{ toYaml .Values.global.meshNetworks | trim | indent 6 }}
  {{- else }}
    networks: {}
  {{- end }}

  mesh: |-
{{- if .Values.meshConfig }}
{{ $mesh | toYaml | indent 4 }}
{{- else }}
{{- include "mesh" . }}
{{- end }}
---

  kubectl -n istio-system get cm istio -o jsonpath="{.data.mesh}" > /tmp/mesh.yaml
  kubectl -n istio-system get cm istio-sidecar-injector -o jsonpath="{.data.values}" > /tmp/values.json

  # Use kube-inject based on captured configuration
  istioctl kube-inject -f samples/bookinfo/platform/kube/bookinfo.yaml \
    --injectConfigFile /tmp/inj-template.tmpl \
    --meshConfigFile /tmp/mesh.yaml \
    --valuesFile /tmp/values.json
`,

    # should be overridden by the command
    ISTIO_META_DNS_CAPTURE: "false"
    # should be overridden by the annotation on the WorkloadGroup
    PROXY_CONFIG_ANNOT_VALUE: "foo"
    # should be in the final cluster.env/mesh.yaml

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package mesh

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"k8s.io/client-go/kubernetes/fake"
	"k8s.io/client-go/rest"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/yaml"

	if matchAmbient {
		log.Infof("Namespace %s is enabled in ambient mesh", namespace)
	} else {
		log.Infof("Namespace %s is disabled from ambient mesh", namespace)
	}
	for _, pod := range s.pods.List(namespace, klabels.Everything()) {
		// ztunnel pods are never "added to/removed from the mesh", so do not fire
		// spurious events for them to avoid triggering extra

	DefaultProxyAdminPort = 15000

	// DefaultMeshConfigMapName is the default name of the ConfigMap with the mesh config
	// The actual name can be different - use getMeshConfigMapName
	DefaultMeshConfigMapName = "istio"

	// ConfigMapKey should match the expected MeshConfig file name
	ConfigMapKey = "mesh"

	// ValuesConfigMapKey should match the expected Values file name
	ValuesConfigMapKey = "values"

CANONICAL_SERVICE='foo'
CA_ADDR='istiod-rev-1.istio-system.svc:15012'
CLUSTER_MESH_CONFIG_VALUE='foo'
ISTIO_INBOUND_PORTS='*'
ISTIO_LOCAL_EXCLUDE_PORTS='22,15090,15021,15020'
ISTIO_METAJSON_LABELS='{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'
ISTIO_META_CLUSTER_ID='Kubernetes'
ISTIO_META_DNS_CAPTURE='true'
ISTIO_META_MESH_ID=''
ISTIO_META_NETWORK=''
ISTIO_META_WORKLOAD_NAME='foo'
ISTIO_NAMESPACE='bar'

		{ // case 2
			Args: strings.Split(
				"--meshConfigFile testdata/mesh-config.yaml"+
					" --injectConfigFile testdata/inject-config.yaml -f testdata/deployment/hello.yaml"+
					" --valuesFile testdata/inject-values.yaml",
				" "),
			GoldenFilename: "testdata/deployment/hello.yaml.injected",
		},
		{ // case 3
			Args: strings.Split(
				"--meshConfigFile testdata/mesh-config.yaml"+

        {{- if .Values.global.meshID }}
        - name: ISTIO_META_MESH_ID
          value: "{{ .Values.global.meshID }}"
        {{- else if (valueOrDefault .MeshConfig.TrustDomain .Values.global.trustDomain) }}
        - name: ISTIO_META_MESH_ID
          value: "{{ (valueOrDefault .MeshConfig.TrustDomain .Values.global.trustDomain) }}"
        {{- end }}
        resources: