nouveau: rename variable as it is a new keyword

nouveau/src/main/java/org/apache/couchdb/nouveau/core/Index.java

@@ -39,19 +39,19 @@ public abstract class Index implements Closeable {
  private long updateSeq;
  private long purgeSeq;
  private boolean deleteOnClose = false;
- private final Semaphore permits = new Semaphore(Integer.MAX_VALUE);
+ private final Semaphore semaphore = new Semaphore(Integer.MAX_VALUE);
 
  protected Index(final long updateSeq, final long purgeSeq) {
  this.updateSeq = updateSeq;
  this.purgeSeq = purgeSeq;
  }
 
  public final boolean tryAcquire() {
- return permits.tryAcquire();
+ return semaphore.tryAcquire();
  }
 
  public final void release() {
- permits.release();
+ semaphore.release();
  }
 
  public final IndexInfo info() throws IOException {
@@ -130,9 +130,9 @@ public final synchronized void setPurgeSeq(final long matchSeq, final long purge
  @Override
  public final void close() throws IOException {
  // Ensures exclusive access to the index before closing.
- permits.acquireUninterruptibly(Integer.MAX_VALUE);
+ semaphore.acquireUninterruptibly(Integer.MAX_VALUE);
  doClose();
- // Never release permits.
+ // Never release semaphore.
  }
 
  protected abstract void doClose() throws IOException;
@@ -146,7 +146,7 @@ public synchronized void setDeleteOnClose(final boolean deleteOnClose) {
  }
 
  public final boolean isActive() {
- return permits.availablePermits() < Integer.MAX_VALUE || permits.hasQueuedThreads();
+ return semaphore.availablePermits() < Integer.MAX_VALUE || semaphore.hasQueuedThreads();
  }
 
  protected final void assertUpdateSeqProgress(final long matchSeq, final long updateSeq)