Elastic Search - Reactive document APIs - elasticsearch

Question

My requirement is to create a spring boot application controller/service that calls elastic search reactive apis with out using traditional model and repositories. i need to pass dynamic json object to create documents in elastic search using spring controller and return dynamic json as a result for queries.
Could you please help me with below questions
Does elastic search has reactive document apis for CRUDQ operations.if exists can we tie those to springboot application for CRUDQ operations without defining a model
I did check few blogs where we can use ReactiveElasticsearchClient (Elasticsearch APIs centric) but takes a model as input to the api. can we create an api without providing model and pass dynamic json for create and return dynamic object as query results.
Thank you in advance!!!

Answer 1

With the repository approach it may not be possible without the models. Having said that , the other way is to use the HTTP API using webflux to approach this problem.
As an example , I have set up a sample index with some data including an employee that matches this name
curl -XPOST "http://localhost:9200/_search" -H 'Content-Type: application/json' -d'{"query": {"match": {"name":"JohnSmith77067"}}}' |jq
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 3.205453,
"hits": [
{
"_index": "sample",
"_type": "employee",
"_id": "KbxD6IEBCsN8USu280mF",
"_score": 3.205453,
"_source": {
"id": null,
"organization": {
"id": 31,
"name": "TestO31",
"address": "Test Street No. 31"
},
"department": {
"id": 3631,
"name": "TestD3631"
},
"name": "JohnSmith77067",
"age": 66,
"position": "Developer"
}
}
]
}
}
will try and emulate this through a free query run through reactive web client
#RestController
#RequestMapping("/employees")
public class EmployeeController {
private static final Logger LOGGER = LoggerFactory.getLogger(EmployeeController.class);
private final WebClient client = WebClient.create();
#PostMapping("/customselect")
public Mono<String> generateMulti() throws URISyntaxException {
return client.post().uri(new URI("http://localhost:9200/_search")).
accept(MediaType.APPLICATION_JSON).
header("Content-Type", "application/json").
body(Mono.just("{\"query\": {\"match\": {\"name\":\"JohnSmith77067\"}}}"), String.class)
.retrieve()
.bodyToMono(String.class);
}
}
starting the app up and then hitting the endpoint will return similar results You could pass a custom query in the body , but you get the idea of this.
[![Postman results][1]][1]
Having a repository based approach takes away all the boilerplate and provides a lot of goodies & error handling through config driven approaches. Having said that if that does not suit , for ES the way would be to use the raw HTTP API (there are many things you could attach to the web clients such as Auth , timeout etc that i have done) and then take it from there. Hope this helps a bit
[1]: https://i.stack.imgur.com/FIAXR.png