public RoutingSpec setTable(int i, RoutingTableSpec table) {
        tables.set(i, table);
        return this;
    }
Sets the routing table spec at the given index.

@param i     The index at which to set the routing table.
@param table The routing table to set.
@return This, to allow chaining.
messagebus/src/main/java/com/yahoo/messagebus/routing/RoutingSpec.java