Connecting and fetching elasticsearch from react Js

pravu · October 19, 2022, 6:59am

Hello,

Would it be possible or is there any library available in javascript to connect and fetch data from elasticsearch index by providing json as input which elasticserver understand.

regards,

Christian_Dahlqvist · October 19, 2022, 7:06am

Have you looked at the official client?

pravu · October 19, 2022, 7:10am

yes, it says the following in "introduction".

This is the official Node.js client for Elasticsearch. This page gives a quick overview about the features of the client.

I need to use J2EE server and would like to write javascript in clientside and not in "Node.js" side..

dadoonet · October 19, 2022, 7:16am

Welcome!

I'd not recommend connecting Elasticsearch from the frontend TBH. That would require to have the frontend aware of the credentials...

Why not doing the backend connection from the backend (your JEE app) and then send to the frontend only what is needed or the full response as a JSON...

See for example:

github.com

dadoonet/legacy-search/blob/60f17334f6fc8fd3d5a4d7162fa59ca0fe4e72c6/src/main/java/fr/pilato/demo/legacysearch/dao/ElasticsearchDao.java#L155


      
                                          .field("dateOfBirth")
                                          .calendarInterval(CalendarInterval.Year)
                                          .extendedBounds(b -> b
                                                  .min(FieldDateMath.of(fdm -> fdm.expr("1940")))
                                                  .max(FieldDateMath.of(fdm -> fdm.expr("2009"))))
                                          .format("8yyyy")))
                                  .sort(sb -> sb.score(scs -> scs))
                                  .sort(sb -> sb.field(fs -> fs.field("dateOfBirth")))
                          , Person.class);
          
          
        return jsonToString(response);
              }
          
          
    private String jsonToString(JsonpSerializable json) {
                  StringWriter writer = new StringWriter();
                  JsonGenerator generator = jacksonJsonpMapper.jsonProvider().createGenerator(writer);
                  json.serialize(generator, jacksonJsonpMapper);
                  generator.close();
                  return writer.toString();
              }
          }

pravu · October 19, 2022, 7:39am

Thanks. Agree that, it is not safe to connect from frontend. But still would like to know if there is any library exists to connect from frontend( Javascript).

pravu · October 19, 2022, 7:44am

May I know the Java library location from where to download, that need to be used in serverside rest API.

system · November 16, 2022, 7:45am

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