The `writeVLong` method in the `org.elasticsearch.common.io.stream.StreamOutput` class of Java is used to write a variable-length long integer value into the output stream. This method serializes a given long value into bytes and writes them into the stream. Variable-length encoding is employed to optimize the storage size of the number, using fewer bytes for smaller values and more bytes for larger values. This method is commonly used in Elasticsearch for efficient serialization of data.
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