How Can I get all the description field content of any issue in JIRA by Java Code?

AsynchronousJiraRestClientFactory factory = new AsynchronousJiraRestClientFactory();
JiraRestClient restClient = factory.create(jiraServerUri, new BasicHttpAuthenticationHandler(“user”, “password”));
IssueRestClient issueClient = restClient.getIssueClient();
Issue issue = issueClient.getIssue(“Demo-123”).claim();
issue.getDescription();

from above code i am getting only text data. I want to get all types of data like Table format, rich text data etc.