public void setLong(final int index, final long value) {
        this.checkIndexLength(index, SIZE_OF_LONG);
        setLongUnchecked(index, value);
    }
Sets the specified 64-bit long integer at the specified absolute
{@code index} in this buffer.

@throws IndexOutOfBoundsException if the specified {@code index} is less than {@code 0} or
{@code index + 8} is greater than {@code this.length()}
embulk-core/src/main/java/org/embulk/exec/Slice.java