solr_http undefined method `iso8601'

[agrubl]

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For all general issues, please provide the following details for fast resolution:

• Version:
  logstash v 7.2.0-1
  looks like solr_http v3.0.5: logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-solr_http-3.0.5/
• Operating System:
  Ubuntu on Windows 10
• Config File (if you have sensitive info, please remove it):
  input {
  syslog {
  type => "syslog"
  host => "127.0.0.1"
  port => 9014
  grok_pattern => "%{SYSLOG5424LINE}"
  }
  syslog {
  type => "syslog"
  host => "127.0.0.1"
  port => 9015
  }
  }
  filter {
  if [tags] {
  #grok error occured
  mutate {
  add_field => { "grokerror" => "%{[tags][0]}" }
  remove_field => [ "tags" ]
  }
  }
  else if [type] == "syslog" {
  }
  }
  output {
  if ![tags] and ![grokerror] {
  solr_http {
  solr_url => "redacted solr http"
  }
  } else {
  stdout { }
  }
  }
• Sample Data:
  [WARN ] 2019-06-25 17:15:10.797 [[main]>worker0] solrhttp - An error occurred while indexing: undefined method `iso8601' for 2019-06-25T21:15:10.601Z:LogStash::Timestamp
• Steps to Reproduce:
  Start logstash using the config file.
  Send a syslog to the logstash server.

-Workaround
Use rSolr version 1.1.2
https://medium.com/@sreekantht/indexing-log-files-to-solr-using-logstash-5aad3aa3dba