public UntagResourceRequest withTagKeys(java.util.Collection<String> tagKeys) {
        setTagKeys(tagKeys);
        return this;
    }
<p>
Tag keys must be unique for a given cluster. In addition, the following restrictions apply:
</p>
<ul>
<li>
<p>
Each tag key must be unique. If you add a tag with a key that's already in use, your new tag overwrites the
existing key-value pair.
</p>
</li>
<li>
<p>
You can't start a tag key with aws: because this prefix is reserved for use by AWS. AWS creates tags that begin
with this prefix on your behalf, but you can't edit or delete them.
</p>
</li>
<li>
<p>
Tag keys must be between 1 and 128 Unicode characters in length.
</p>
</li>
<li>
<p>
Tag keys must consist of the following characters: Unicode letters, digits, white space, and the following
special characters: _ . / = + -

@.</p> </li>
       </ul>
@param tagKeys
       <p>
       Tag keys must be unique for a given cluster. In addition, the following restrictions apply:
       </p>
       <ul>
       <li>
       <p>
       Each tag key must be unique. If you add a tag with a key that's already in use, your new tag overwrites
       the existing key-value pair.
       </p>
       </li>
       <li>
       <p>
       You can't start a tag key with aws: because this prefix is reserved for use by AWS. AWS creates tags that
       begin with this prefix on your behalf, but you can't edit or delete them.
       </p>
       </li>
       <li>
       <p>
       Tag keys must be between 1 and 128 Unicode characters in length.
       </p>
       </li>
       <li>
       <p>
       Tag keys must consist of the following characters: Unicode letters, digits, white space, and the following
       special characters: _ . / = + -
@.</p> </li>
       </ul>
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-kafka/src/main/java/com/amazonaws/services/kafka/model/UntagResourceRequest.java