fluentd Fluent::Plugin::Parser::ParserError error="pattern not matched with data - fluentd

Question

I am using 1.24 version EKS. I am using the below fluentd config and I am getting below error. I tried with many format combinations but nothing worked.
2023-02-16 21:02:57 +0000 [warn]: #0 dump an error event: error_class=Fluent::Plugin::Parser::ParserError error="pattern not matched with data '{\"app\":\"JavaApp\",\"time\":\"2023-02-16T19:21:50.206+00:00\",\"logger\":\"com.example.App\",\"level\":\"INFO\",\"class\":\"org.springframework.boot.StartupInfoLogger\",\"method\":\"logStarted\",\"file\":\"StartupInfoLogger.java\",\"line\":61,\"thread\":\"main\",\"msg\":\"Started App in 7.718 seconds (JVM running for 10.822)\"}'" location=nil tag="kubernetes.var.log.containers.java-app-78b5d9c689-btm25_default_java-app-dc08d83479a29fe04e193b0b3b93b20aa61ad3b8746f11617f7ca5ae3e59d948.log" time=2023-02-16 19:21:50.237968502 +0000 record={"stream"=>"stdout", "logtag"=>"F", "log"=>"{\"app\":\"JavaApp\",\"time\":\"2023-02-16T19:21:50.206+00:00\",\"logger\":\"com.example.App\",\"level\":\"INFO\",\"class\":\"org.springframework.boot.StartupInfoLogger\",\"method\":\"logStarted\",\"file\":\"StartupInfoLogger.java\",\"line\":61,\"thread\":\"main\",\"msg\":\"Started App in 7.718 seconds (JVM running for 10.822)\"}"}
2023-02-16 21:02:57 +0000 [warn]: #0 no patterns matched tag="kubernetes.var.log.containers.java-app-78b5d9c689-btm25_default_java-app-dc08d83479a29fe04e193b0b3b93b20aa61ad3b8746f11617f7ca5ae3e59d948.log"
Here is my config,
kind: ConfigMap
apiVersion: v1
metadata:
name: fluentd-forwarder-cm
namespace: default
labels:
app.kubernetes.io/component: forwarder
app.kubernetes.io/instance: fluentd
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: fluentd
helm.sh/chart: fluentd-1.3.0
annotations:
meta.helm.sh/release-name: fluentd
meta.helm.sh/release-namespace: default
data:
fluentd.conf: |
# Ignore fluentd own events
<match fluent.**>
#type null
</match>
# HTTP input for the liveness and readiness probes
<source>
#type http
port 9880
</source>
# Throw the healthcheck to the standard output instead of forwarding it
<match fluentd.healthcheck>
#type null
</match>
# Get the logs from the containers running in the node
<source>
#type tail
path /var/log/containers/*java-app*.log
pos_file /opt/bitnami/fluentd/logs/buffers/fluentd-docker.pos
tag kubernetes.*
read_from_head true
<parse>
#type multi_format
<pattern>
format regexp
time_format %Y-%m-%dT%H:%M:%S.%NZ
expression /^(?<time>.+)(?<stream>stdout|stderr) (?<logtag>.)? (?<log>.*)/
</pattern>
</parse>
</source>
<filter **>
#type parser
key_name log
<parse>
#type multi_format
<pattern>
format json
time_key time
time_type string
time_format "%Y-%m-%dT%H:%M:%S.%NZ"
keep_time_key true
</pattern>
</parse>
</filter>
# enrich with kubernetes metadata
<filter kubernetes.**>
#type kubernetes_metadata
</filter>
I even tried in Fluentulor to make sure the parsing works.
What am I missing here?