driver-core/src/main/com/mongodb/internal/connection/tlschannel/impl/BufferHolder.java
public void zero() {
        ((Buffer) buffer).mark();
        ((Buffer) buffer).position(0);
        buffer.put(ZEROS, 0, buffer.remaining());
        ((Buffer) buffer).reset();
    }
public void zero() {
        ((Buffer) buffer).mark();
        ((Buffer) buffer).position(0);
        buffer.put(ZEROS, 0, buffer.remaining());
        ((Buffer) buffer).reset();
    }
Fill the buffer with zeros. This method does not change the buffer position.
<p>
Typically used for security reasons, with buffers that contains
now-unused plaintext.