public Builder writePartition(final String writePartition) {
            this.writePartition = writePartition;
            return this;
        }
Specifies the name of the partition to write when adding vertices, edges and vertex properties.  This
name can be any user defined value.  It is only possible to write to a single partition at a time.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/PartitionStrategy.java