how to insert unique data in Elasticsearch index document in java

Question

this is my previous question - how to insert data in elastic search index

index mapping is as follows

{
 "test" : {
   "mappings" : {
     "properties" : {
        "name" : {
          "type" : "keyword"
        },
        "info" : {
          "type" : "nested"
        },
        "joining" : {
           "type" : "date"
        }
    }
}

how can i check the data of field is already present or not before uploading a data to the index

Note :- I dont have id field maintained in index. need to check name in each document if it is already present then dont insert document into index

thanks in advance

Answer 1

As you don't have a id field in your mapping, you have to search on name field and you can use below code to search on it.

public List<SearchResult> search(String searchTerm) throws IOException {
        SearchRequest searchRequest = new SearchRequest(INDEX_NAME);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        MatchQueryBuilder multiMatchQueryBuilder = new 
        MatchQueryBuilder(searchTerm, "firstName");
        searchSourceBuilder.query(matchQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = esclient.search(searchRequest, RequestOptions.DEFAULT);
        return getSearchResults(searchResponse);

    }

Note, as you have keyword field instead of match you can use termquerybuilder

And it uses the utility method to parse the searchResponse of ES, code of which is below:

private List<yourpojo> getSearchResults(SearchResponse searchResponse) {
        RestStatus status = searchResponse.status();
        TimeValue took = searchResponse.getTook();
        Boolean terminatedEarly = searchResponse.isTerminatedEarly();
        boolean timedOut = searchResponse.isTimedOut();

        // Start fetching the documents matching the search results.
        //https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-high-search
        // .html#java-rest-high-search-response-search-hits
        SearchHits hits = searchResponse.getHits();
        SearchHit[] searchHits = hits.getHits();
        List<sr> sr = new ArrayList<>();
        for (SearchHit hit : searchHits) {
            // do something with the SearchHit
            String index = hit.getIndex();
            String id = hit.getId();
            float score = hit.getScore();

            //String sourceAsString = hit.getSourceAsString();
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String firstName = (String) sourceAsMap.get("firstName");
            
            sr.add(userSearchResultBuilder.build());
        }