add Opensearch config parameters override samples

src/pages/cli/graphql/override.mdx

@@ -118,6 +118,71 @@ export function override(resources: AmplifyApiGraphQlResourceStackTemplate) {
 }
 ```
 
+### Example - Configure OpenSearch Streaming function name
+Override the name of the AWS Lambda searchable streaming function
+
+```ts
+import { AmplifyApiGraphQlResourceStackTemplate } from '@aws-amplify/cli-extensibility-helper';
+
+export function override(resources: AmplifyApiGraphQlResourceStackTemplate) {
+  resources.opensearch.OpenSearchStreamingLambdaFunction.FunctionName = 'CustomFunctionName';
+}
+
+```
+
+### Example - Configure OpenSearch instance version
+
+Override the `elasticsearchVersion` in the OpenSearch domain created by `@searchable`
+
+```ts
+import { AmplifyApiGraphQlResourceStackTemplate } from '@aws-amplify/cli-extensibility-helper';
+
+export function override(resources: AmplifyApiGraphQlResourceStackTemplate) {
+  resources.opensearch.OpenSearchDomain.elasticsearchVersion = 'OpenSearch_1.3';
+}
+```
+### Example - Configure OpenSearch instance type
+
+Override the type of instance launched into the OpenSearch domain created by `@searchable`
+
+```ts
+import { AmplifyApiGraphQlResourceStackTemplate } from '@aws-amplify/cli-extensibility-helper';
+
+export function override(resources: AmplifyApiGraphQlResourceStackTemplate) {
+  resources.opensearch.OpenSearchDomain.elasticsearchClusterConfig = {
+    ...resources.opensearch.OpenSearchDomain.elasticsearchClusterConfig,
+    instanceType: "m3.medium.elasticsearch",
+  };
+}
+```
+### Example - Configure OpenSearch instance count
+Override the number of instances launched into the OpenSearch domain created by `@searchable`
+
+```ts
+import { AmplifyApiGraphQlResourceStackTemplate } from '@aws-amplify/cli-extensibility-helper';
+
+export function override(resources: AmplifyApiGraphQlResourceStackTemplate) {
+  resources.opensearch.OpenSearchDomain.elasticsearchClusterConfig = {
+    ...resources.opensearch.OpenSearchDomain.elasticsearchClusterConfig,
+    instanceCount : 2
+  };
+}
+```
+
+### Example - Configure OpenSearch EBS volume size
+Override the amount of disk space allocated to each instance in the OpenSearch domain created by `@searchable`
+
+```ts
+import { AmplifyApiGraphQlResourceStackTemplate } from '@aws-amplify/cli-extensibility-helper';
+
+export function override(resources: AmplifyApiGraphQlResourceStackTemplate) {
+  resources.opensearch.OpenSearchDomain.ebsOptions={
+    ...resources.opensearch.OpenSearchDomain.ebsOptions,
+    volumeSize:10
+  }    
+}
+```
+
 ## Customize Amplify-generated resources for @predictions directive
 
 Apply all the overrides in the `override(...)` function. For example, to add a Path to IAM role that facilitates text translation:
@@ -197,4 +262,4 @@ To map the CreatePostResolver and the relational resolvers to a stack named 'MyC
   "BlogpostsResolver": "MyCustomStack",
   "PostblogResolver": "MyCustomStack",
 }
-```
+```