public Boolean isForceAliasCreation() {
        return this.forceAliasCreation;
    }
<p>
This parameter is used only if the <code>phone_number_verified</code> or <code>email_verified</code> attribute is
set to <code>True</code>. Otherwise, it is ignored.
</p>
<p>
If this parameter is set to <code>True</code> and the phone number or email address specified in the
UserAttributes parameter already exists as an alias with a different user, the API call will migrate the alias
from the previous user to the newly created user. The previous user will no longer be able to log in using that
alias.
</p>
<p>
If this parameter is set to <code>False</code>, the API throws an <code>AliasExistsException</code> error if the
alias already exists. The default value is <code>False</code>.
</p>

@return This parameter is used only if the <code>phone_number_verified</code> or <code>email_verified</code>
        attribute is set to <code>True</code>. Otherwise, it is ignored.</p>
        <p>
        If this parameter is set to <code>True</code> and the phone number or email address specified in the
        UserAttributes parameter already exists as an alias with a different user, the API call will migrate the
        alias from the previous user to the newly created user. The previous user will no longer be able to log
        in using that alias.
        </p>
        <p>
        If this parameter is set to <code>False</code>, the API throws an <code>AliasExistsException</code> error
        if the alias already exists. The default value is <code>False</code>.
aws-java-sdk-cognitoidp/src/main/java/com/amazonaws/services/cognitoidp/model/AdminCreateUserRequest.java