```

**Step 3: Import to Fess**

Option A: Via Admin UI
1. Go to **System > Backup**
2. Upload `fess-documents.json` (bulk format)
3. Click **Import**

Option B: Via Bulk API
```bash
curl -X PUT "http://localhost:8080/api/admin/documents/bulk" \
  -H "Content-Type: application/x-ndjson" \
  -u admin:admin \
  --data-binary @fess-documents.json
```

#### Index Settings Migration

        }

    }

    /**
     * Gets the bulk buffer size for batch operations.
     *
     * @return The bulk buffer size.
     */
    public int getBulkBufferSize() {
        return bulkBufferSize;
    }

    /**
     * Sets the bulk buffer size for batch operations.
     *
     * @param bulkBufferSize The bulk buffer size.
     */

    //

    /**
     * Performs bulk document operations (index multiple documents).
     * Validates document fields and adds default values where necessary.
     *
     * @param body the bulk request body containing documents to process
     * @return JSON response with bulk operation results
     */
    // PUT /api/admin/documents/bulk
    @Execute
    public JsonResponse<ApiResult> put$bulk(final BulkBody body) {

import java.util.List;
import java.util.Map;

/**
 * Request body for bulk document operations containing a list of documents.
 */
public class BulkBody {

    /**
     * Creates a new instance of BulkBody.
     */
    public BulkBody() {
        // Default constructor
    }

    /**
     * List of documents to be processed in bulk operations.
     */
    public List<Map<String, Object>> documents;

import org.codelibs.fess.suggest.settings.SuggestSettings;
import org.codelibs.fess.suggest.util.SuggestUtil;
import org.opensearch.action.bulk.BulkItemResponse;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.bulk.BulkResponse;
import org.opensearch.action.get.GetResponse;
import org.opensearch.action.index.IndexAction;
import org.opensearch.action.index.IndexRequest;

        }
    }

    /**
     * Performs bulk update operations using a custom bulk request builder.
     *
     * @param consumer Consumer function to configure the bulk request builder
     * @return true if all bulk operations were successful, false otherwise
     * @throws InterruptedRuntimeException if the operation is interrupted
     * @throws SearchEngineClientException if the bulk update fails
     */

import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.util.ComponentUtil;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.bulk.BulkResponse;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.action.update.UpdateRequestBuilder;
import org.opensearch.index.query.QueryBuilders;

import org.codelibs.fess.suggest.normalizer.NormalizerChain;
import org.codelibs.fess.suggest.settings.AnalyzerSettings;
import org.codelibs.fess.suggest.settings.SuggestSettings;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.bulk.BulkResponse;
import org.opensearch.action.delete.DeleteRequest;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.common.xcontent.json.JsonXContent;

        return client.prepareDelete(index, id);
    }

    @Override
    public ActionFuture<BulkResponse> bulk(final BulkRequest request) {
        return client.bulk(request);
    }

    @Override
    public void bulk(final BulkRequest request, final ActionListener<BulkResponse> listener) {
        client.bulk(request, listener);
    }

    @Override
    public BulkRequestBuilder prepareBulk() {

import org.codelibs.fess.util.DocList;
import org.codelibs.fess.util.MemoryUtil;
import org.opensearch.action.admin.indices.refresh.RefreshResponse;
import org.opensearch.action.bulk.BulkItemResponse;
import org.opensearch.action.bulk.BulkItemResponse.Failure;
import org.opensearch.action.bulk.BulkResponse;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;