public CreateIndexRequest withApplicationId(String applicationId) {
        setApplicationId(applicationId);
        return this;
    }
<p>
The identifier of the Amazon Q Business application using the index.
</p>

@param applicationId
       The identifier of the Amazon Q Business application using the index.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-qbusiness/src/main/java/com/amazonaws/services/qbusiness/model/CreateIndexRequest.java