}

    /**
     * Scrolls through all documents in the specified index and applies the callback function to each hit.
     *
     * @param index the name of the index to scroll through
     * @param callback the function to apply to each search hit, returning true to continue or false to stop
     * @return the number of documents processed
     */

        POPULARWORD,
        /** Favorite API format. */
        FAVORITE,
        /** Favorites API format. */
        FAVORITES,
        /** Ping API format. */
        PING,
        /** Scroll API format. */
        SCROLL,
        /** Suggest API format. */
        SUGGEST,
        /** Other API format. */
        OTHER;
    }

    /**
     * Default constructor for BaseApiManager.
     */

import io.restassured.path.json.JsonPath;
import io.restassured.response.Response;

/**
 * Integration tests for the Scroll Search API (/api/v1/documents/all)
 * This test requires crawled documents and api.search.scroll to be enabled
 */
@Tag("it")
@Disabled("Requires api.search.scroll to be enabled in fess_config.properties")
public class ScrollSearchApiTests extends CrawlTestBase {

**Describe the bug**
A clear and concise description of what the bug is.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

                    try (final BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out.stream(), Constants.CHARSET_UTF_8))) {
                        SearchEngineUtil.scroll(index, hit -> {
                            try {
                                writer.write("{\"index\":{\"_index\":\"" + index + "\",\"_id\":\""