how to insert unique data in Elasticsearch index document in java

this is my previous question - https://stackoverflow.com/q/63918143/13504695

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

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());
		}