Unable to retrieve data through Elasticsearch

Elastic Stack Elasticsearch
1

I'm able to perform all crud operations but whenever I tried to retrieve information through Elasticsearch I'm unable to do so.
GET
http://localhost:8080/topics/

{
"id": "1",
"name": "Java",
"desc": "Java Language Course"
}

The result isnot being displayed
POST
http://localhost:9200/topics/_search

{
"took": 35,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 0,
"max_score": null,
"hits":
}
}

2 
GET http://localhost:8080/topics/

Wrong port?

What's the result of:

GET http://localhost:9200/_search
GET http://localhost:9200/_cat/indices?v
3

the port 8080 is working fine. I have tried changing the port as well. Produced the same results.

GET http://localhost:9200/_search
Result:
{
"took": 35,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 0,
"max_score": null,
"hits":
}
}

GET http://localhost:9200/_cat/indices?v

health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open topics Rno1Gz78QpChFuIsc0ciUg 5 1 0 0 1.2kb 1.2kb

4

Elasticsearch does not listen to 2 REST ports. I'm unsure what service is running under 8080.

According to your last post, you did not index any document in elasticsearch. That's why you have no result.

5

Do you by any chance have 2 different Elasticsearch nodes/clusters that listen to ports 8080 and 9200 respectively?