async function createDocumentSchema() {
    // The full resource name of the location, e.g.:
    // projects/{project_number}/locations/{location}
    const parent = `projects/${projectNumber}/locations/${location}`;
    // Initialize request argument(s)
    const request = {
      parent: parent,
      // Document Schema
      documentSchema: {
        displayName: 'My Test Schema',
        // Property Definition
        propertyDefinitions: [
          {
            name: 'testPropertyDefinitionName', // Must be unique within a document schema (case insensitive)
            displayName: 'searchable text',
            isSearchable: true,
            textTypeOptions: {},
          },
        ],
      },
    };

    // Make Request
    const response = serviceClient.createDocumentSchema(request);

    // Print out response
    response.then(
      result =>
        console.log(`Document Schema Created: ${JSON.stringify(result)}`),
      error => console.log(`${error}`)
    );
  }
TODO(developer): Uncomment these variables before running the sample.
const projectNumber = 'YOUR_PROJECT_NUMBER';
const location = 'YOUR_PROJECT_LOCATION'; // Format is 'us' or 'eu'