* @return configured StorageClient
     */
    public static StorageClient createClient(final FessConfig fessConfig) {
        final String endpoint = fessConfig.getStorageEndpoint();
        final String accessKey = fessConfig.getStorageAccessKey();
        final String secretKey = fessConfig.getStorageSecretKey();
        final String bucket = fessConfig.getStorageBucket();

        // Get explicit type or auto-detect

- `ftp:.*`, `ftps:.*` → FtpClient
- `storage:.*` → StorageClient, `s3:.*` → S3Client, `gcs:.*` → GcsClient

### Cloud Storage Clients

- **S3Client**: AWS SDK v2, `s3://bucket/path`, properties: `endpoint`, `accessKey`, `secretKey`, `region`
- **GcsClient**: Google Cloud SDK, `gcs://bucket/path`, properties: `projectId`, `credentialsFile`, `endpoint`
- **StorageClient**: MinIO SDK, `storage://bucket/path`

### Services

    public static final String STORAGE_ENDPOINT = "storage.endpoint";

    /** Storage access key configuration key. */
    public static final String STORAGE_ACCESS_KEY = "storage.accesskey";

    /** Storage secret key configuration key. */
    public static final String STORAGE_SECRET_KEY = "storage.secretkey";

    /** Storage bucket configuration key. */

    }

    public static Optional<AccessorKey> maybeGetKeyOfOldAccessorOfUpgradedProperty(JApiCompatibility jApiCompatibility, ViolationCheckContext context) {
        if (!(jApiCompatibility instanceof JApiMethod) || ((JApiMethod) jApiCompatibility).getOldMethod().isEmpty()) {
            return Optional.empty();
        }
        JApiMethod jApiMethod = (JApiMethod) jApiCompatibility;

 *
 * <p>Rate limiters are often used to restrict the rate at which some physical or logical resource
 * is accessed. This is in contrast to {@link java.util.concurrent.Semaphore} which restricts the
 * number of concurrent accesses instead of the rate (note though that concurrency and rate are
 * closely related, e.g. see <a href="http://en.wikipedia.org/wiki/Little%27s_law">Little's
 * Law</a>).
 *

import java.io.Serializable;
import java.util.Map;
import java.util.Set;

import org.dbflute.Entity;
import org.dbflute.FunCustodial;
import org.dbflute.dbmeta.accessory.EntityModifiedProperties;
import org.dbflute.dbmeta.accessory.EntityUniqueDrivenProperties;
import org.dbflute.util.DfCollectionUtil;
import org.opensearch.action.delete.DeleteRequestBuilder;
import org.opensearch.action.index.IndexRequestBuilder;

/**

    Violation acceptOrReject(JApiCompatibility member, List<String> changes, Violation rejection) {
        Set<ApiChange> seenApiChanges = (Set<ApiChange>) context.userData["seenApiChanges"]
        Set<AccessorKey> seenOldAccessorsOfUpgradedProperties = (Set<AccessorKey>) context.userData[SEEN_OLD_REMOVED_ACCESSORS_OF_UPGRADED_PROPERTIES]

   *
   * <p>If {@code node} is removed from the graph after this method is called, the {@code Set}
   * {@code view} returned by this method will be invalidated, and will throw {@code
   * IllegalStateException} if it is accessed in any way, with the following exceptions:
   *
   * <ul>
   *   <li>{@code view.equals(view)} evaluates to {@code true} (but any other {@code equals()}
   *       expression involving {@code view} will throw)

   *
   * <p>If {@code node} is removed from the network after this method is called, the {@code Set}
   * {@code view} returned by this method will be invalidated, and will throw {@code
   * IllegalStateException} if it is accessed in any way, with the following exceptions:
   *
   * <ul>
   *   <li>{@code view.equals(view)} evaluates to {@code true} (but any other {@code equals()}
   *       expression involving {@code view} will throw)

   * network interceptors return.
   */
  internal var interceptorScopedExchange: Exchange? = null
    private set

  // These properties are guarded by `this`. They are typically only accessed by the thread executing
  // the call, but they may be accessed by other threads for duplex requests.

  private var requestBodyOpen = false
  private var responseBodyOpen = false
  private var socketSinkOpen = false