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_DefineIndexField.go
    path of file: ./repos/aws-sdk-go-v2/service/cloudsearch
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package cloudsearch

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

// Configures an IndexField for the search domain. Used to create new fields and
// modify existing ones. You must specify the name of the domain you are
// configuring and an index field configuration. The index field configuration
// specifies a unique name, the index field type, and the options you want to
// configure for the field. The options you can specify depend on the
// IndexFieldType . If the field exists, the new configuration replaces the old
// one. For more information, see Configuring Index Fields (http://docs.aws.amazon.com/cloudsearch/latest/developerguide/configuring-index-fields.html)
// in the Amazon CloudSearch Developer Guide.
func (c *Client) DefineIndexField(ctx context.Context, params *DefineIndexFieldInput, optFns ...func(*Options)) (*DefineIndexFieldOutput, error) {
	if params == nil {
		params = &DefineIndexFieldInput{}
	}

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

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

// Container for the parameters to the DefineIndexField operation. Specifies the
// name of the domain you want to update and the index field configuration.
type DefineIndexFieldInput 
    
func (c *Client) addOperationDefineIndexFieldMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsquery_serializeOpDefineIndexField{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpDefineIndexField{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DefineIndexField"); 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 = addOpDefineIndexFieldValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDefineIndexField(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
}