How do I search for a specific string in several possible fields via elastic search

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Java

Elasticsearch

My search term is "A & H" and I want to find any item that has that term somewhere in either Number or VendorName - and it has to be exact. I don't want it if it has an A and a space, an H somewhere, or a & without the full search string. (There are a few other restrictions like Customer, you'll see that in my code)

I keep getting way too many results that do not have the entire search string in there. Can someone tell me how to phrase the query correctly, and/or what the Java would look like to put that together?

What I have tried:

{
  "from" : 0,
  "size" : 500,
  "query" : {
    "bool" : {
      "must" : [ {
        "bool" : {
          "must" : {
            "match" : {
              "CustomerID" : {
                "query" : 5,
                "type" : "boolean"
              }
            }
          }
        }
      }, {
        "multi_match" : {
          "query" : "A & H",
          "fields" : [ "VendorName", "Number" ]
        }
      } ]
    }
  },
  "sort" : [ {
    "VendorName.raw" : {
      "order" : "asc"
    }
  } ]
}

- which I built by doing:

MultiMatchQueryBuilder mqbs = QueryBuilders.multiMatchQuery(criteriaQuery, "VendorName", "Number");
vendorQuery.must(mqbs);

SearchSourceBuilder searchBuilder = buildBaseSearchSourceBuilder(mapPayload).query(vendorQuery);
searchBuilder.sort("VendorName.raw", SortOrder.ASC);

Search search = new Search.Builder(searchBuilder.toString()).addIndex(searchProperties.getVendorAliasName())
        .addType(VENDOR_TYPE).build();

SearchResult result = client.execute(search);