You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: api_op_ModifyReplicationGroup.go
    path of file: ./repos/aws-sdk-go-v2/service/elasticache
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package elasticache

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/elasticache/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Modifies the settings for a replication group. This is limited to Redis 7 and
// newer.
//   - Scaling for Amazon ElastiCache for Redis (cluster mode enabled) (https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/scaling-redis-cluster-mode-enabled.html)
//     in the ElastiCache User Guide
//   - ModifyReplicationGroupShardConfiguration (https://docs.aws.amazon.com/AmazonElastiCache/latest/APIReference/API_ModifyReplicationGroupShardConfiguration.html)
//     in the ElastiCache API Reference
//
// This operation is valid for Redis only.
func (c *Client) ModifyReplicationGroup(ctx context.Context, params *ModifyReplicationGroupInput, optFns ...func(*Options)) (*ModifyReplicationGroupOutput, error) {
	if params == nil {
		params = &ModifyReplicationGroupInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "ModifyReplicationGroup", params, optFns, c.addOperationModifyReplicationGroupMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*ModifyReplicationGroupOutput)
	out.ResultMetadata = metadata
	return out, nil
}

// Represents the input of a ModifyReplicationGroups operation.
type ModifyReplicationGroupI
    
func (c *Client) addOperationModifyReplicationGroupMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsquery_serializeOpModifyReplicationGroup{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpModifyReplicationGroup{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "ModifyReplicationGroup"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpModifyReplicationGroupValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opModifyReplicationGroup(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}