public void setIndexSizeBytes(Long indexSizeBytes) {
        this.indexSizeBytes = indexSizeBytes;
    }
<p>
The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours.
Recent changes might not be reflected in this value.
</p>

@param indexSizeBytes
       The total size of the specified index, in bytes. DynamoDB updates this value approximately every six
       hours. Recent changes might not be reflected in this value.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/model/GlobalSecondaryIndexDescription.java