Merge changes I8f129dcf,I6af4c15d into stable-2.16

* changes:
  Switch PatchListCache to using legacy cache backend
  Replace guava caches with caffeine
diff --git a/java/com/google/gerrit/elasticsearch/ElasticVersion.java b/java/com/google/gerrit/elasticsearch/ElasticVersion.java
index 309ee3e5..574a226 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticVersion.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticVersion.java
@@ -30,7 +30,8 @@
   V7_1("7.1.*"),
   V7_2("7.2.*"),
   V7_3("7.3.*"),
-  V7_4("7.4.*");
+  V7_4("7.4.*"),
+  V7_5("7.5.*");
 
   private final String version;
   private final Pattern pattern;
diff --git a/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java b/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
index c0f27bd..a5ac3a9 100644
--- a/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
+++ b/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
@@ -37,7 +37,7 @@
 
   @ConfigSuite.Config
   public static Config elasticsearchV7() {
-    return getConfig(ElasticVersion.V7_4);
+    return getConfig(ElasticVersion.V7_5);
   }
 
   @Override
diff --git a/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java b/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
index 61a490b..5348c53 100644
--- a/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
+++ b/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
@@ -36,7 +36,7 @@
 
   @ConfigSuite.Config
   public static Config elasticsearchV7() {
-    return getConfig(ElasticVersion.V7_4);
+    return getConfig(ElasticVersion.V7_5);
   }
 
   @Override
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java b/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
index c15f1a7..c692a3b 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -62,6 +62,8 @@
         return "blacktop/elasticsearch:7.3.2";
       case V7_4:
         return "blacktop/elasticsearch:7.4.2";
+      case V7_5:
+        return "blacktop/elasticsearch:7.5.0";
     }
     throw new IllegalStateException("No tests for version: " + version.name());
   }
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
index 08f4839..94c5a04 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
@@ -21,7 +21,12 @@
 import com.google.gerrit.testing.IndexConfig;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.client.protocol.HttpClientContext;
+import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
+import org.apache.http.impl.nio.client.HttpAsyncClients;
 import org.eclipse.jgit.lib.Config;
+import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 
@@ -33,6 +38,7 @@
 
   private static ElasticNodeInfo nodeInfo;
   private static ElasticContainer container;
+  private static CloseableHttpAsyncClient client;
 
   @BeforeClass
   public static void startIndexService() {
@@ -43,6 +49,8 @@
 
     container = ElasticContainer.createAndStart(ElasticVersion.V6_8);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
+    client = HttpAsyncClients.createDefault();
+    client.start();
   }
 
   @AfterClass
@@ -52,6 +60,16 @@
     }
   }
 
+  @After
+  public void closeIndex() {
+    client.execute(
+        new HttpPost(
+            String.format(
+                "http://localhost:%d/%s*/_close", nodeInfo.port, getSanitizedMethodName())),
+        HttpClientContext.create(),
+        null);
+  }
+
   @Override
   protected void initAfterLifecycleStart() throws Exception {
     super.initAfterLifecycleStart();
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryAccountsTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryAccountsTest.java
index 069ca20..5e533fb 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryAccountsTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryAccountsTest.java
@@ -41,7 +41,7 @@
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V7_4);
+    container = ElasticContainer.createAndStart(ElasticVersion.V7_5);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
   }
 
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryChangesTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryChangesTest.java
index 0290c7a..3c70ed5 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryChangesTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryChangesTest.java
@@ -47,7 +47,7 @@
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V7_4);
+    container = ElasticContainer.createAndStart(ElasticVersion.V7_5);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
     client = HttpAsyncClients.createDefault();
     client.start();
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryGroupsTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryGroupsTest.java
index a60068c..f2dcdaa 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryGroupsTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryGroupsTest.java
@@ -41,7 +41,7 @@
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V7_4);
+    container = ElasticContainer.createAndStart(ElasticVersion.V7_5);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
   }
 
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryProjectsTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryProjectsTest.java
index cf93f6f..e2de7fe 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryProjectsTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticV7QueryProjectsTest.java
@@ -41,7 +41,7 @@
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V7_4);
+    container = ElasticContainer.createAndStart(ElasticVersion.V7_5);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
   }
 
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
index 8198ced..b5c455d 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
@@ -63,6 +63,9 @@
 
     assertThat(ElasticVersion.forVersion("7.4.0")).isEqualTo(ElasticVersion.V7_4);
     assertThat(ElasticVersion.forVersion("7.4.1")).isEqualTo(ElasticVersion.V7_4);
+
+    assertThat(ElasticVersion.forVersion("7.5.0")).isEqualTo(ElasticVersion.V7_5);
+    assertThat(ElasticVersion.forVersion("7.5.1")).isEqualTo(ElasticVersion.V7_5);
   }
 
   @Test
@@ -88,6 +91,7 @@
     assertThat(ElasticVersion.V7_2.isAtLeastMinorVersion(ElasticVersion.V6_7)).isFalse();
     assertThat(ElasticVersion.V7_3.isAtLeastMinorVersion(ElasticVersion.V6_7)).isFalse();
     assertThat(ElasticVersion.V7_4.isAtLeastMinorVersion(ElasticVersion.V6_7)).isFalse();
+    assertThat(ElasticVersion.V7_5.isAtLeastMinorVersion(ElasticVersion.V6_7)).isFalse();
   }
 
   @Test
@@ -105,6 +109,7 @@
     assertThat(ElasticVersion.V7_2.isV6OrLater()).isTrue();
     assertThat(ElasticVersion.V7_3.isV6OrLater()).isTrue();
     assertThat(ElasticVersion.V7_4.isV6OrLater()).isTrue();
+    assertThat(ElasticVersion.V7_5.isV6OrLater()).isTrue();
   }
 
   @Test
@@ -122,5 +127,6 @@
     assertThat(ElasticVersion.V7_2.isV7OrLater()).isTrue();
     assertThat(ElasticVersion.V7_3.isV7OrLater()).isTrue();
     assertThat(ElasticVersion.V7_4.isV7OrLater()).isTrue();
+    assertThat(ElasticVersion.V7_5.isV7OrLater()).isTrue();
   }
 }
diff --git a/tools/nongoogle.bzl b/tools/nongoogle.bzl
index d0a683c..1552595 100644
--- a/tools/nongoogle.bzl
+++ b/tools/nongoogle.bzl
@@ -61,8 +61,8 @@
     # elasticsearch-rest-client explicitly depends on this version
     maven_jar(
         name = "httpcore-nio",
-        artifact = "org.apache.httpcomponents:httpcore-nio:4.4.11",
-        sha1 = "7d0a97d01d39cff9aa3e6db81f21fddb2435f4e6",
+        artifact = "org.apache.httpcomponents:httpcore-nio:4.4.12",
+        sha1 = "84cd29eca842f31db02987cfedea245af020198b",
     )
 
     maven_jar(
@@ -94,8 +94,8 @@
     # and httpasyncclient as necessary.
     maven_jar(
         name = "elasticsearch-rest-client",
-        artifact = "org.elasticsearch.client:elasticsearch-rest-client:7.4.2",
-        sha1 = "f48725523c0b3402f869214433602f8d3f4c737c",
+        artifact = "org.elasticsearch.client:elasticsearch-rest-client:7.5.0",
+        sha1 = "62535b6fc3a4e943e88e7640eac22e29f03a696d",
     )
 
     maven_jar(