DescribeTrainingJob returns ValidationException instead of ResourceNotFoundException for non-existent resource

[stobrien89]

Origin: boto/boto3#2808, Requester: @haandol

Describe the bug

describe_training_job method occurs ValidationException instead of ResourceNotFound for not existing resource.

Steps to reproduce

tested on boto3==1.17.43, botocore==1.20.43

import boto3                                                                       
import botocore                                                                    
                                                                                   
client = boto3.client('sagemaker')                                                 
                                                                                   
try:                                                                               
    print(client.describe_training_job(TrainingJobName='not-existing-training-job-name'))                
except client.exceptions.ResourceNotFound:                                         
    print('caught')                                                                
except botocore.exceptions.ClientError as error:                                   
    if error.response['Error']['Code'] == 'ResourceNotFound':                      
        print('caught inner')                                                      
    else:                                                                          
        print(error.response)                                                      
        print('common') 

Expected behavior

above code should raise ResourceNotFound error and print caught
but it raises ValidationException and prints common

Service team request: V341946505

[tim-finnigan]

The service team is continuing to track this issue in their backlog. As mentioned in the original issue, this would likely be a documentation change rather than an API behavior change, because this is technically old behavior that would be backwards-incompatible if changed. For any additional documentation feedback you can use the Provide feedback link at the bottom of API documentation pages like DescribeTrainingJob.

[github-actions]

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