Couchbase MuteteInResult always returns Index 0 is invalid error

Java SDK
1 

public boolean changeDataFetchOrder(String caseId, String taskId, boolean isRandom) {
    var searchId = "case" + ":" + caseId + ":" + taskId;
    Collection collection = bucket.defaultCollection();
    
    var result = collection.mutateIn(searchId, Collections.singletonList(
            upsert("isDataFetchOrderRandom", isRandom)
    ));
    
    return result.contentAs(0, Boolean.class);
}

This operation changes the field in database but it does not returns result of operation. Should I do an extra configuration?

com.couchbase.client.core.error.InvalidArgumentException: Index 0 is invalid
    at com.couchbase.client.core.error.InvalidArgumentException.fromMessage(InvalidArgumentException.java:28) ~[core-io-2.3.0.jar:na]
    at com.couchbase.client.java.kv.MutateInResult.getFieldAtIndex(MutateInResult.java:118) ~[java-client-3.3.0.jar:na]
    at com.couchbase.client.java.kv.MutateInResult.contentAs(MutateInResult.java:91) ~[java-client-3.3.0.jar:na]
    at com.couchbase.client.java.kv.MutateInResult.contentAs(MutateInResult.java:68) ~[java-client-3.3.0.jar:na]
    at com.company.caseuploadapi.service.couchbase.CaseRepositoryImpl.changeDataFetchOrder(CaseRepositoryImpl.java:179) ~[classes/:na]
    at com.company.caseuploadapi.service.cases.defaults.CaseService.setDataFetchOrder(CaseService.java:371) ~[classes/:na]
    at com.company.caseuploadapi.controller.CaseController.setDataFetchOrder(CaseController.java:79) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
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