OpenSearch's describe-domains action without domain names does not return info about all domains

Describe the bug

Documentation of describe-domains of OpenSearch Service says:

If you don’t specify any domains, OpenSearch Service returns information about all domains owned by the account.

https://awscli.amazonaws.com/v2/documentation/api/latest/reference/opensearch/describe-domains.html

But it doesn't. It returns the empty array if I set domains to the empty.

Expected Behavior

% aws opensearch describe-domains --domain-names
{
    "DomainStatusList": [
        ...Info of all domains here...
    ]
}

Current Behavior

% aws opensearch describe-domains --domain-names
{
    "DomainStatusList": []
}

Reproduction Steps

Just call aws opensearch describe-domains with --domain-names empty.

Possible Solution

(none)

Additional Information/Context

I also tried the same thing using AWS SDK for Ruby, but it returns the empty array, too. It may be a bug of AWS REST API, or a documentation bug of the API.

% irb
irb(main):001:0> require 'aws-sdk-opensearchservice'
=> true
irb(main):002:0> client = Aws::OpenSearchService::Client.new
=> #<Aws::OpenSearchService::Client>
irb(main):003:0> client.describe_domains({domain_names: []})
=> #<struct Aws::OpenSearchService::Types::DescribeDomainsResponse domain_status_list=[]>

Also, if you pass the empty string to --domain-names on AWS CLI, it raises an error:

% aws opensearch describe-domains --domain-names ''

Parameter validation failed:
Invalid length for parameter DomainNames[0], value: 0, valid min length: 3

CLI version used

aws-cli/2.12.1 Python/3.11.4 Darwin/22.5.0 source/arm64 prompt/off

Environment details (OS name and version, etc.)

macOS Ventura 13.4, Apple M2 Mac, MacBook Pro

aws / aws-sdk