aeron-client/src/main/java/io/aeron/logbuffer/LogBufferDescriptor.java
public static void initialiseTailWithTermId(
        final UnsafeBuffer metadataBuffer, final int partitionIndex, final int termId)
    {
        metadataBuffer.putLong(TERM_TAIL_COUNTERS_OFFSET + (partitionIndex * SIZE_OF_LONG), packTail(termId, 0));
    }
public static void initialiseTailWithTermId(
        final UnsafeBuffer metadataBuffer, final int partitionIndex, final int termId)
    {
        metadataBuffer.putLong(TERM_TAIL_COUNTERS_OFFSET + (partitionIndex * SIZE_OF_LONG), packTail(termId, 0));
    }
Set the initial value for the termId in the upper bits of the tail counter.

@param metadataBuffer contain the tail counter.
@param partitionIndex to be initialised.
@param termId         to be set.