Set timeout of auto put-follow request to unbounded (#61679)

If the master node of the follower cluster is busy, then the 
auto-follower will fail to initialize the following process. This also
occurs when an auto-follow pattern matches multiple indices. We should
set the timeout of put-follow requests issued by the auto-follower to
unbounded to avoid this problem.

Closes #56891

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/action/AutoFollowCoordinator.java

@@ -571,6 +571,7 @@ public class AutoFollowCoordinator extends AbstractLifecycleComponent implements
             request.getParameters().setMaxWriteBufferSize(pattern.getMaxWriteBufferSize());
             request.getParameters().setMaxRetryDelay(pattern.getMaxRetryDelay());
             request.getParameters().setReadPollTimeout(pattern.getReadPollTimeout());
+            request.masterNodeTimeout(TimeValue.MAX_VALUE);
 
             // Execute if the create and follow api call succeeds:
             Runnable successHandler = () -> {

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/action/AutoFollowCoordinatorTests.java

@@ -148,6 +148,7 @@ public class AutoFollowCoordinatorTests extends ESTestCase {
                 assertThat(followRequest.getRemoteCluster(), equalTo("remote"));
                 assertThat(followRequest.getLeaderIndex(), equalTo("logs-20190101"));
                 assertThat(followRequest.getFollowerIndex(), equalTo("logs-20190101"));
+                assertThat(followRequest.masterNodeTimeout(), equalTo(TimeValue.MAX_VALUE));
                 successHandler.run();
             }
 
@@ -296,6 +297,7 @@ public class AutoFollowCoordinatorTests extends ESTestCase {
                 assertThat(followRequest.getRemoteCluster(), equalTo("remote"));
                 assertThat(followRequest.getLeaderIndex(), equalTo("logs-20190101"));
                 assertThat(followRequest.getFollowerIndex(), equalTo("logs-20190101"));
+                assertThat(followRequest.masterNodeTimeout(), equalTo(TimeValue.MAX_VALUE));
                 successHandler.run();
             }
 
@@ -500,6 +502,7 @@ public class AutoFollowCoordinatorTests extends ESTestCase {
                 void createAndFollow(Map<String, String> headers, PutFollowAction.Request request,
                                      Runnable successHandler, Consumer<Exception> failureHandler) {
                     assertThat(request.getRemoteCluster(), equalTo(remoteCluster));
+                    assertThat(request.masterNodeTimeout(), equalTo(TimeValue.MAX_VALUE));
                     assertThat(request.getFollowerIndex(), startsWith("copy-"));
                     followedIndices.add(request.getLeaderIndex());
                     successHandler.run();
@@ -615,6 +618,7 @@ public class AutoFollowCoordinatorTests extends ESTestCase {
                                  Runnable successHandler,
                                  Consumer<Exception> failureHandler) {
                 assertThat(followRequest.getRemoteCluster(), equalTo("remote"));
+                assertThat(followRequest.masterNodeTimeout(), equalTo(TimeValue.MAX_VALUE));
                 assertThat(followRequest.getLeaderIndex(), equalTo("logs-20190101"));
                 assertThat(followRequest.getFollowerIndex(), equalTo("logs-20190101"));
                 failureHandler.accept(failure);