early quit if is not reusable

Author: arturobernalg

httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/H2SharingConnPool.java

@@ -290,6 +290,10 @@ PoolEntry<T, C> lease() {
         long release(final PoolEntry<T, C> entry, final boolean reusable) {
             lock.lock();
             try {
+                if (!reusable) {
+                    entry.discardConnection(CloseMode.GRACEFUL);
+                }
+
                 final AtomicLong counter = entryMap.compute(entry, (e, c) -> {
                     if (c == null) {
                         return null;

httpclient5/src/test/java/org/apache/hc/client5/http/impl/nio/H2SharingConnPoolTest.java

@@ -345,7 +345,7 @@ void testReleaseNonReusableNotInCacheReturnedToPool() throws Exception {
         }).when(connPool).release(Mockito.eq(poolEntry), Mockito.anyBoolean());
 
         h2SharingPool.release(poolEntry, false);
-        h2SharingPool.release(poolEntry, false);
+        // for reproduce https://issues.apache.org/jira/browse/HTTPCLIENT-2379
         Assertions.assertThrows(IllegalStateException.class, () -> h2SharingPool.release(poolEntry, false));
     }