We limit the number of concurrent blob downloads per node and per recovery, but if a user configures too many concurrent recoveries they may run out of per-node download permits which yields the following message:

> Unable to acquire permit to use snapshot files during recovery, this recovery will recover index files from the source node. Ensure snapshot files can be used during recovery by setting [indices.recovery.max_concurrent_snapshot_file_downloads] to be no greater than [25]

The `[25]` here is wrong, the 25 permits are shared across all inbound recoveries so we should divide the suggested value by `cluster.routing.allocation.node_concurrent_incoming_recoveries`. In extreme cases the user may have configured so many concurrent recoveries that the only reasonable limit is zero, and in that case we should suggest setting `indices.recovery.use_snapshots: false` instead.


test/framework/src/main/java/org/elasticsearch/test/MockLogAppender.java
Loggers.addAppender(logger, this);
        }
        return () -> {
            for (final var logger : loggers) {
                Loggers.removeAppender(logger, this);
            }
            stop();
            
            for (WrappedLoggingExpectation expectation : expectations) {
                assertThat(
                    "Method assertMatched() not called on LoggingExpectation instance before release: " + expectation,
                    expectation.assertMatchedCalled.get(),
                    is(true)
                );
            }
        };
    }
    /**
     * Executes an action and verifies expectations against the provided logger
     */
    public static void assertThatLogger(Runnable action, Class<?> loggerOwner, MockLogAppender.AbstractEventExpectation expectation) {
        MockLogAppender mockAppender = new MockLogAppender();
        try (var ignored = mockAppender.capturing(loggerOwner)) {
            mockAppender.addExpectation(expectation);
            action.run();
            mockAppender.assertAllExpectationsMatched();
        }
    }
}