BSON field ‘collMod.index.unique’ is an unknown field

Hi guys!
I have a problem after upgrading Spring Boot to version 4.4.0 (MongoDB driver 5.2.1). I can no longer create an unique index:

org.springframework.data.mongodb.UncategorizedMongoDbException: Command failed with error 40415 (Location40415): 'BSON field 'collMod.index.unique' is an unknown field.' on server int01-pl-mo-a-1.easypack24.net:27017. The full response is {"ok": 0.0, "errmsg": "BSON field 'collMod.index.unique' is an unknown field.", "code": 40415, "codeName": "Location40415", "$clusterTime": {"clusterTime": {"$timestamp": {"t": 1733395265, "i": 86}}, "signature": {"hash": {"$binary": {"base64": "e7b1zCSZjPbuCF605KyeSN/SKjI=", "subType": "00"}}, "keyId": 7390671167658393754}}, "operationTime": {"$timestamp": {"t": 1733395265, "i": 86}}}
	at org.springframework.data.mongodb.core.MongoExceptionTranslator.doTranslateException(MongoExceptionTranslator.java:151)
	at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:74)
	at org.springframework.data.mongodb.core.MongoTemplate.potentiallyConvertRuntimeException(MongoTemplate.java:3008)
	at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:584)
	at org.springframework.data.mongodb.core.DefaultIndexOperations.alterIndex(DefaultIndexOperations.java:170)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:382)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:254)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:173)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:454)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:387)
	at org.springframework.boot.context.event.EventPublishingRunListener.ready(EventPublishingRunListener.java:109)
	at org.springframework.boot.SpringApplicationRunListeners.lambda$ready$6(SpringApplicationRunListeners.java:80)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
	at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
	at org.springframework.boot.SpringApplicationRunListeners.ready(SpringApplicationRunListeners.java:80)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:332)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:102)
	at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:64)
	at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:40)
Caused by: com.mongodb.MongoCommandException: Command failed with error 40415 (Location40415): 'BSON field 'collMod.index.unique' is an unknown field.' on server int01-pl-mo-a-1.easypack24.net:27017. The full response is {"ok": 0.0, "errmsg": "BSON field 'collMod.index.unique' is an unknown field.", "code": 40415, "codeName": "Location40415", "$clusterTime": {"clusterTime": {"$timestamp": {"t": 1733395265, "i": 86}}, "signature": {"hash": {"$binary": {"base64": "e7b1zCSZjPbuCF605KyeSN/SKjI=", "subType": "00"}}, "keyId": 7390671167658393754}}, "operationTime": {"$timestamp": {"t": 1733395265, "i": 86}}}
	at com.mongodb.internal.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:210)
	at com.mongodb.internal.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:520)
	at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceiveInternal(InternalStreamConnection.java:448)
	at com.mongodb.internal.connection.InternalStreamConnection.lambda$sendAndReceive$0(InternalStreamConnection.java:375)
	at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:378)
	at com.mongodb.internal.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:111)
	at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:748)
	at com.mongodb.internal.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:68)
	at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:208)
	at com.mongodb.internal.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:113)
	at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:82)
	at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:73)
	at com.mongodb.internal.connection.DefaultServer$OperationCountTrackingConnection.command(DefaultServer.java:298)
	at com.mongodb.internal.operation.SyncOperationHelper.createReadCommandAndExecute(SyncOperationHelper.java:298)
	at com.mongodb.internal.operation.SyncOperationHelper.lambda$executeRetryableRead$3(SyncOperationHelper.java:197)
	at com.mongodb.internal.operation.SyncOperationHelper.lambda$withSourceAndConnection$0(SyncOperationHelper.java:131)
	at com.mongodb.internal.operation.SyncOperationHelper.withSuppliedResource(SyncOperationHelper.java:156)
	at com.mongodb.internal.operation.SyncOperationHelper.lambda$withSourceAndConnection$1(SyncOperationHelper.java:130)
	at com.mongodb.internal.operation.SyncOperationHelper.withSuppliedResource(SyncOperationHelper.java:156)
	at com.mongodb.internal.operation.SyncOperationHelper.withSourceAndConnection(SyncOperationHelper.java:129)
	at com.mongodb.internal.operation.SyncOperationHelper.lambda$executeRetryableRead$4(SyncOperationHelper.java:195)
	at com.mongodb.internal.operation.SyncOperationHelper.lambda$decorateReadWithRetries$13(SyncOperationHelper.java:317)
	at com.mongodb.internal.async.function.RetryingSyncSupplier.get(RetryingSyncSupplier.java:67)
	at com.mongodb.internal.operation.SyncOperationHelper.executeRetryableRead(SyncOperationHelper.java:201)
	at com.mongodb.internal.operation.SyncOperationHelper.executeRetryableRead(SyncOperationHelper.java:180)
	at com.mongodb.internal.operation.CommandReadOperation.execute(CommandReadOperation.java:52)
	at com.mongodb.client.internal.MongoClusterImpl$OperationExecutorImpl.execute(MongoClusterImpl.java:358)
	at com.mongodb.client.internal.MongoDatabaseImpl.executeCommand(MongoDatabaseImpl.java:215)
	at com.mongodb.client.internal.MongoDatabaseImpl.runCommand(MongoDatabaseImpl.java:184)
	at com.mongodb.client.internal.MongoDatabaseImpl.runCommand(MongoDatabaseImpl.java:179)
	at com.mongodb.client.internal.MongoDatabaseImpl.runCommand(MongoDatabaseImpl.java:169)
	at org.springframework.data.mongodb.core.DefaultIndexOperations.lambda$alterIndex$2(DefaultIndexOperations.java:170)
	at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:582)
	... 27 more

My MongoDB version is 5.0. It worked well before upgrading Spring version.
According to the documentation, latest Mongo driver should fully supports Mongo 5.0, so is it some kind of driver’s bug?