// one or more matching JSON records
//System.out.println("In existence search, we got first name: " + firstName + ", last name:" + lastName);
BloomFilter b = new BloomCache().getCachedBloomFilter();
b.populate();
ObjectMapper mapper = new ObjectMapper();
JsonNode rootNode = mapper.createObjectNode(); // will be of type ObjectNode
//JsonNode responseNode = mapper.createObjectNode(); // will be of type ObjectNode
if (b.test(firstName+lastName)) { // that is, if it was found in the bloom filter
((ObjectNode)rootNode).put("Exists", true);
} else {((ObjectNode)rootNode).put("Exists", false);}