Transport response handler not found of id [1]

Hey there,
We are being haunted by this Warning/error " Transport response handler not found of id [1]" from the past week., can someone please help us explain and resolve this issue.
we are running elasticsearch as a single node cluster in a single node docker-swarm cluster for a java-based spring-boot project.
Here are the config details. and stack trace warning/error.

Running Elasticsearch Version

{
  "name" : "7NdAu6q",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "lNXtdq57Rg67KerJ18DWEA",
  "version" : {
    "number" : "5.0.0",
    "build_hash" : "253032b",
    "build_date" : "2016-10-26T05:11:34.737Z",
    "build_snapshot" : false,
    "lucene_version" : "6.2.0"
  },
  "tagline": "You Know, for Search"
}

Running Docker version

Client: Docker Engine - Community
 Version:           19.03.13
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        4484c46d9d
 Built:             Wed Sep 16 17:02:36 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.13
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       4484c46d9d
  Built:            Wed Sep 16 17:01:06 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.3.7
  GitCommit:        8fba4e9a7d01810a393d5d25a3621dc101981175
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

elasticsearch.yaml config file

http.host: 0.0.0.0

# Uncomment the following lines for a production cluster deployment
transport.host: 0.0.0.0

docker-compose.yml file

version: '3.5'
services:
    test-elasticsearch:
    image: elasticsearch:5.0.0
    deploy:
      restart_policy:
        condition: on-failure
        delay: 5s
        max_attempts: 3
        window: 120s
      placement:
        constraints: [node.role == manager]
 
    environment:
      - ES_JAVA_OPTS="-Xms2g -Xmx2g"

    volumes:
      - /home/ubuntu/testdata/:/usr/share/elasticsearch/data
    configs:
      - source: elasticsearch.yml
        target: /usr/share/elasticsearch/config/elasticsearch.yml
    ports:
      - 9200:9200
      - 9300:9300
configs:
  elasticsearch.yml:
    external: true




Stack-trace Warning/Error

2021-02-16 12:54:07.336  INFO 954243 --- [           main] o.h.h.i.QueryTranslatorFactoryInitiator  : HHH000397: Using ASTQueryTranslatorFactory
2021-02-16 12:54:08.325  INFO 954243 --- [           main] o.elasticsearch.plugins.PluginsService   : no modules loaded
2021-02-16 12:54:08.329  INFO 954243 --- [           main] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.index.reindex.ReindexPlugin]
2021-02-16 12:54:08.329  INFO 954243 --- [           main] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.join.ParentJoinPlugin]
2021-02-16 12:54:08.329  INFO 954243 --- [           main] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.percolator.PercolatorPlugin]
2021-02-16 12:54:08.329  INFO 954243 --- [           main] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.script.mustache.MustachePlugin]
2021-02-16 12:54:08.329  INFO 954243 --- [           main] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.transport.Netty4Plugin]
2021-02-16 12:54:10.398  INFO 954243 --- [           main] o.s.d.e.c.TransportClientFactoryBean     : Adding transport node : 192.168.0.2:9300
2021-02-16 12:54:10.584  WARN 954243 --- [ient_boss][T#1]] o.e.transport.TransportService           : Transport response handler not found of id [1]
2021-02-16 12:54:10.788  WARN 954243 --- [ient_boss][T#2]] o.e.transport.TransportService           : Transport response handler not found of id [3]
2021-02-16 12:54:15.255  WARN 954243 --- [ient_boss][T#7]] o.e.transport.TransportService           : Transport response handler not found of id [57]
2021-02-16 12:54:20.287  WARN 954243 --- [ient_boss][T#8]] o.e.transport.TransportService           : Transport response handler not found of id [59]
2021-02-16 12:54:25.304  WARN 954243 --- [ient_boss][T#1]] o.e.transport.TransportService           : Transport response handler not found of id [61]
2021-02-16 12:54:30.326  WARN 954243 --- [ient_boss][T#2]] o.e.transport.TransportService           : Transport response handler not found of id [63]
2021-02-16 12:54:35.337  WARN 954243 --- [ient_boss][T#3]] o.e.transport.TransportService           : Transport response handler not found of id [65]
2021-02-16 12:54:40.345  WARN 954243 --- [ient_boss][T#4]] o.e.transport.TransportService           : Transport response handler not found of id [67]
2021-02-16 12:54:45.352  WARN 954243 --- [ient_boss][T#5]] o.e.transport.TransportService           : Transport response handler not found of id [69]
2021-02-16 12:54:50.360  WARN 954243 --- [ient_boss][T#6]] o.e.transport.TransportService           : Transport response handler not found of id [71]
2021-02-16 12:54:55.369  WARN 954243 --- [ient_boss][T#7]] o.e.transport.TransportService           : Transport response handler not found of id [73]
2021-02-16 12:55:00.381  WARN 954243 --- [ient_boss][T#8]] o.e.transport.TransportService           : Transport response handler not found of id [75]
2021-02-16 12:55:05.400  WARN 954243 --- [ient_boss][T#1]] o.e.transport.TransportService           : Transport response handler not found of id [77]
2021-02-16 12:55:10.414  WARN 954243 --- [ient_boss][T#2]] o.e.transport.TransportService           : Transport response handler not found of id [79]
2021-02-16 12:55:15.425  WARN 954243 --- [ient_boss][T#3]] o.e.transport.TransportService           : Transport response handler not found of id [81]
2021-02-16 12:55:20.434  WARN 954243 --- [ient_boss][T#4]] o.e.transport.TransportService           : Transport response handler not found of id [83]
2021-02-16 12:55:25.444  WARN 954243 --- [ient_boss][T#5]] o.e.transport.TransportService           : Transport response handler not found of id [85]
2021-02-16 12:55:30.456  WARN 954243 --- [ient_boss][T#6]] o.e.transport.TransportService           : Transport response handler not found of id [87]
2021-02-16 12:55:35.468  WARN 954243 --- [ient_boss][T#7]] o.e.transport.TransportService           : Transport response handler not found of id [89]

Please help us in identifying the root cause of this issue and how to resolve it as well.

Regards