How to Implement a Flexible Search Method in Java with Low Level Client to Filter, Sort, and Limit Fields?

Elastic Stack Elasticsearch
1

Hello,

I'm working on implementing a search method in Java that needs to support several variations of search criteria. Specifically, I need the method to be able to:

  1. Search by a term within certain fields, conditionally filter the data by a date range, limit the output to only include specified fields, and sort the results by one or more fields.
  2. Perform the same operations as above but use a filterMap for filtering instead of a search term.
  3. Combine both term-based and filterMap-based filtering.

Here's the signature of the method I've come up with: private List<Map<String, Object>> search( final Set<String> requestedFields, final List<SortBy> sortByList, final List<String> termSearchableFields, final String searchTerm, final Map<String, Object> filterMap, final DateRangeTerm dateRangeTerm )...

2

This is what it boils down to: > GET patdocument-1382/_search

{
"query": {
"multi_match": {
"query": "Patient Letter-Lara",
"fields":["DocumentName","AuthorName"]
}
},
"fields": [
"DocumentName",
"AuthorName",
"CreatedDate"
],
"post_filter": {"range": { "CreatedDate.keyword": {"gte":"2022-10-04 23:44:37.000000","lte":"2023-06-24 05:46:49.000000"}}},
"sort" : [
{ "CreatedDate.keyword": {"order": "desc"}}],

"_source": false
}

3

This is the solution:

    String searchText = "xx";
    List fields = new ArrayList<>();
    fields.add("DocumentName");
    fields.add("AuthorName");

    List fieldsToReturn = new ArrayList<FieldAndFormat>();
   // list.add() ....
    double maxPricemaxPrice = 200.0;
    List sortOptions = new ArrayList<SortOptions>();
    RangeQuery range = RangeQuery.of(r -> r
            .field("price")
            .gte(JsonData.of(maxPricemaxPrice)) // <3>
    )._toQuery().range();
            try {
                SearchResponse<PatDocument2> response = client.search(s -> s
                                .index("patdocument-3482")
                                .query(q -> q
                                        .multiMatch(t -> t
                                                .fields(fields)
                                                .query(searchText)
                                        )
                                ).fields(fieldsToReturn)
                                .postFilter(r->r.range(range))
                                .sort(sortOptions),
                        PatDocument2.class);
4

It's not with the Low Level client then. May I suggest that you edit the title of your post?