this.witnessClient = null;
                    this.witnessEnabled = false;
                }

                // Clear trees collection atomically
                if (this.trees != null) {
                    this.trees.clear();
                }
            }
        } else if (usage < 0) {
            throw new RuntimeCIFSException("Usage count dropped below zero");
        }

        }
      }
      return false;
    }

    @Override
    public void clear() {
      Arrays.fill(hashTable, null);
      size = 0;
      for (ValueEntry<K, V> entry = firstEntry; entry != null; entry = entry.successorInValueSet) {
        multimapIterationChain.delete(entry);
        // TODO(cpovirk): Also clear *InValueSet (after reading next) and nextInValueBucket?
      }
      firstEntry = null;

  @CanIgnoreReturnValue
  @Override
  public final boolean retainAll(Collection<?> elementsToRetain) {
    return Multisets.retainAllImpl(this, elementsToRetain);
  }

  @Override
  public abstract void clear();

  // Views

  @LazyInit private transient @Nullable Set<E> elementSet;

  @Override
  public Set<E> elementSet() {
    Set<E> result = elementSet;
    if (result == null) {

    /**
     * Creation time of the crawling information.
     */
    public String createdTime;

    /**
     * Clears all pagination state and crawling information fields.
     * Resets all counts, page flags, and crawling-specific fields to their default values.
     */
    public void clear() {
        allRecordCount = 0;
        allPageCount = 0;
        existPrePage = false;
        existNextPage = false;

    public String errorCount;

    /** Last time this URL was accessed. */
    public String lastAccessTime;

    /**
     * Clears all pager data and resets to default values.
     * This method resets pagination state and search filters.
     */
    public void clear() {
        allRecordCount = 0;
        allPageCount = 0;
        existPrePage = false;
        existNextPage = false;

        return count;
    }

    /**
     * Clears a scroll context.
     *
     * @param scrollId The scroll ID to clear.
     */
    public void clearScroll(final String scrollId) {
        if (scrollId != null) {
            prepareClearScroll().addScrollId(scrollId)
                    .execute(ActionListener.wrap(res -> {}, e -> logger.warn("Failed to clear scroll context: scrollId={}", scrollId, e)));
        }
    }

        }
      }
      return false;
    }

    @Override
    public void clear() {
      Arrays.fill(hashTable, null);
      size = 0;
      for (ValueEntry<K, V> entry = firstEntry; entry != null; entry = entry.successorInValueSet) {
        multimapIterationChain.delete(entry);
        // TODO(cpovirk): Also clear *InValueSet (after reading next) and nextInValueBucket?
      }
      firstEntry = null;

    assertEquals(1, segment.count);
    assertThat(segment.get(key, hash)).isEqualTo(newValue);

    // cleared
    segment.setWeakValueReferenceForTesting(entry, oldValueRef);
    oldValueRef.clear();
    assertFalse(segment.replace(key, hash, oldValue, newValue));
    assertEquals(0, segment.count);
    assertThat(segment.get(key, hash)).isNull();
  }

  public void testSegmentReplace() {

    assertEquals(1, segment.count);
    assertThat(segment.get(key, hash)).isEqualTo(newValue);

    // cleared
    segment.setWeakValueReferenceForTesting(entry, oldValueRef);
    oldValueRef.clear();
    assertFalse(segment.replace(key, hash, oldValue, newValue));
    assertEquals(0, segment.count);
    assertThat(segment.get(key, hash)).isNull();
  }

  public void testSegmentReplace() {

     * @throws UnsupportedOperationException always
     * @deprecated Unsupported operation.
     */
    @Deprecated
    @Override
    @DoNotCall("Always throws UnsupportedOperationException")
    public final void clear() {
      throw new UnsupportedOperationException();
    }

    /**
     * Scope the return type to {@link UnmodifiableIterator} to ensure this is an unmodifiable view.
     *