@SdkInternalApi
    final TagResourceResult executeTagResource(TagResourceRequest tagResourceRequest) {

        ExecutionContext executionContext = createExecutionContext(tagResourceRequest);
        AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
        awsRequestMetrics.startEvent(Field.ClientExecuteTime);
        Request<TagResourceRequest> request = null;
        Response<TagResourceResult> response = null;

        try {
            awsRequestMetrics.startEvent(Field.RequestMarshallTime);
            try {
                request = new TagResourceRequestProtocolMarshaller(protocolFactory).marshall(super.beforeMarshalling(tagResourceRequest));
                // Binds the request metrics to the current request.
                request.setAWSRequestMetrics(awsRequestMetrics);
                request.addHandlerContext(HandlerContextKey.CLIENT_ENDPOINT, endpoint);
                request.addHandlerContext(HandlerContextKey.ENDPOINT_OVERRIDDEN, isEndpointOverridden());
                request.addHandlerContext(HandlerContextKey.SIGNING_REGION, getSigningRegion());
                request.addHandlerContext(HandlerContextKey.SERVICE_ID, "EntityResolution");
                request.addHandlerContext(HandlerContextKey.OPERATION_NAME, "TagResource");
                request.addHandlerContext(HandlerContextKey.ADVANCED_CONFIG, advancedConfig);

            } finally {
                awsRequestMetrics.endEvent(Field.RequestMarshallTime);
            }

            HttpResponseHandler<AmazonWebServiceResponse<TagResourceResult>> responseHandler = protocolFactory.createResponseHandler(
                    new JsonOperationMetadata().withPayloadJson(true).withHasStreamingSuccessResponse(false), new TagResourceResultJsonUnmarshaller());
            response = invoke(request, responseHandler, executionContext);

            return response.getAwsResponse();

        } finally {

            endClientExecution(awsRequestMetrics, request, response);
        }
    }
<p>
Assigns one or more tags (key-value pairs) to the specified Entity Resolution resource. Tags can help you
organize and categorize your resources. You can also use them to scope user permissions by granting a user
permission to access or change only resources with certain tag values. In Entity Resolution,
<code>SchemaMapping</code> and <code>MatchingWorkflow</code> can be tagged. Tags don't have any semantic meaning
to Amazon Web Services and are interpreted strictly as strings of characters. You can use the
<code>TagResource</code> action with a resource that already has tags. If you specify a new tag key, this tag is
appended to the list of tags associated with the resource. If you specify a tag key that is already associated
with the resource, the new tag value that you specify replaces the previous value for that tag.
</p>

@param tagResourceRequest
@return Result of the TagResource operation returned by the service.
@throws InternalServerException
        This exception occurs when there is an internal failure in the Entity Resolution service.
@throws ResourceNotFoundException
        The resource could not be found.
@throws ValidationException
        The input fails to satisfy the constraints specified by Entity Resolution.
@sample AWSEntityResolution.TagResource
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/entityresolution-2018-05-10/TagResource" target="_top">AWS
     API Documentation</a>
aws-java-sdk-entityresolution/src/main/java/com/amazonaws/services/entityresolution/AWSEntityResolutionClient.java