fluentD not parisng logs without a timestap - fluentd

Question

This is my current fluentID configuration that parses JSON and standard logs with a timestamp:
<source>
#id fluentd-containers.log
#type tail
path /var/log/containers/*.log
pos_file /var/log/containers.log.pos
tag raw.test.*
read_from_head true
<parse>
#type multi_format
<pattern>
format json
time_key time
time_format %Y-%m-%dT%H:%M:%S.%NZ
</pattern>
<pattern>
format /^(?<time>.+) (?<stream>stdout|stderr) [^ ]* (?<log>.*)$/
time_format %Y-%m-%dT%H:%M:%S.%N%:z
</pattern>
</parse>
</source>
<match raw.test.**>
#id raw.test
#type detect_exceptions
remove_tag_prefix raw
message log
stream stream
multiline_flush_interval 5
max_bytes 500000
max_lines 1000
</match>
<filter **>
#id filter_concat
#type concat
key message
multiline_end_regexp /\n$/
separator ""
</filter>
<filter test.**>
#id filter_kubernetes_metadata
#type kubernetes_metadata
</filter>
<filter test.**>
#id filter_test
#type grep
<regexp>
key log
pattern ^(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(?:\.\d{3})?)\s+(ERROR|INFO|WARN|DEBUG|TRACE)\s?\s.*
</regexp>
</filter>
<filter test.**>
#id filter_severity
#type parser
key_name log
reserve_data true
<parse>
#type regexp
expression ^(?<timestamp>\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(?:.\d{3})?)\s+(?<severity>ERROR|INFO|WARN|DEBUG|TRACE)\s+(?:--- +\[\s*(?<process>[^]]*)\] +(?<class>\S*) +: +(?<syslog_message>.*)|traceId=(?<traceId>[^\s]*)\sspanId=(?<spanId>[^\s]*)\ssampled=(?<sampled>[^\s]*)\s\[(?<class2>[^]]+)\]\s\((?<process2>[^)]+)\)\s(?<syslog_message2>.*))
</parse>
</filter>
<filter test.**>
#type record_transformer
enable_ruby
<record>
process ${record["process2"] != nil ? record["process2"] : record["process"]}
class ${record["class2"] != nil ? record["class2"] : record["class"]}
syslog_message ${record["syslog_message2"] != nil ? record["syslog_message2"] : record["syslog_message"]}
</record>
remove_keys process2,class2,syslog_message2
</filter>
<filter test.**>
#id filter_parser
#type parser
key_name log
reserve_data true
remove_key_name_field true
<parse>
#type multi_format
<pattern>
format json
</pattern>
<pattern>
format none
</pattern>
</parse>
</filter>
<match test.**>
#id elasticsearch
#type elasticsearch_dynamic
Can you please advise me on setting up the filter that would not ignore multiline logs without a timestamp?
[ERROR] testAll{TestCase}[41] Time elapsed: 0.059 s <<< ERROR!
javax.ws.rs.NotFoundException: HTTP 404 Not Found
[ERROR] Test.testAll:225->restClientPut:292 » NotFound HTTP 404 Not Foun...
java.lang.RuntimeException: java.net.SocketTimeoutException: Connect timed out
[INFO] Results:
I've tried to create a filter with regex where add level and message
/(?<level>[^\s]+)(?<message>.*)/
, but fluentD ignores it and does not send the logs.