Opensearch extraOutputs values for the aws-for-fluent-bit chart are never retrieved

**Describe the bug**
We tried to configure opensearch extraOutputs for the aws-for-fluent-bit chart but the specified values are never retrieved.

It seems that there is a typo in the `configmap.yaml` file (`stable/aws-for-fluent-bit/templates/configmap.yaml`) at line 451.

The line is:

```
{{ .Values.opensearch.extraOutputsIndent_8 }}
```

it should be:
```
{{ .Values.opensearch.extraOutputs | Indent 8 }}
```

**Steps to reproduce**
In the helm values file for the opensearch output of the aws-for-fluent-bit chart, we have the following configuration:
```
opensearch:
enabled: true
match: "*"
host:
port: "443"
tls: "on"
...
extraOutputs: |
tls.verify off
tls.debug 4
```

**Expected outcome**
In the generated fluent-bit.yaml configuration file, we should see something like this:
```
[OUTPUT]
Name opensearch
Match *
Host
Port 443
tls on
...
tls.verify off
tls.debug 4
```

**Environment**

* Chart name: `aws-for-fluent-bit`
* Chart version: `2.28.4`
* Kubernetes version: `1.24`
* Using EKS (yes/no), if so version? `eks.6`

**Additional Context**:

Inspect stable/aws-for-fluent-bit/templates/configmap.yaml around line 451, starting with how the opensearch extraOutputs value is rendered. Render the chart with the issue's opensearch values and confirm that the generated fluent-bit.yaml contains the configured tls.verify and tls.debug lines with the expected indentation.

Written by the indexing model from the issue text.