src/main/java/org/apache/datasketches/server/UpdateHandler.java [174:181]:
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            if (!inputPair.has(QUERY_PAIR_ITEM_FIELD) || !inputPair.has(QUERY_PAIR_WEIGHT_FIELD)) {
              throw new IllegalArgumentException("VarOpt input pairs must include both "
                  + QUERY_PAIR_ITEM_FIELD + " and " + QUERY_PAIR_WEIGHT_FIELD + " values");
            }
            final String item = inputPair.get(QUERY_PAIR_ITEM_FIELD).getAsString();
            final double weight = inputPair.get(QUERY_PAIR_WEIGHT_FIELD).getAsDouble();
            ((VarOptItemsSketch<String>) entry.sketch_).update(item, weight);
          } else {
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src/main/java/org/apache/datasketches/server/UpdateHandler.java [267:274]:
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          if (!inputPair.has(QUERY_PAIR_ITEM_FIELD) || !inputPair.has(QUERY_PAIR_WEIGHT_FIELD)) {
            throw new IllegalArgumentException("VarOpt input pairs must include both "
                + QUERY_PAIR_ITEM_FIELD + " and " + QUERY_PAIR_WEIGHT_FIELD + " values");
          }
          final String item = inputPair.get(QUERY_PAIR_ITEM_FIELD).getAsString();
          final double weight = inputPair.get(QUERY_PAIR_WEIGHT_FIELD).getAsDouble();
          ((VarOptItemsSketch<String>) entry.sketch_).update(item, weight);
        } else {
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