Sri Bhargava

`Error: Invalid FieldReference: `[` Exception: Java::OrgLogstash::FieldReference::IllegalSyntaxException Stack: org.logstash.FieldReference$StrictTokenizer.tokenize(FieldReference.java:283) org.logstash.FieldReference.parse(FieldReference.java:184) org.logstash.FieldReference.parseToCache(FieldReference.java:175) org.logstash.FieldReference.from(FieldReference.java:107) org.logstash.FieldReference.lambda$from$0(FieldReference.java:98) java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1737) org.logstash.FieldReference.from(FieldReference.java:98) org.logstash.ConvertedMap.convertKey(ConvertedMap.java:102) org.logstash.ConvertedMap.access$000(ConvertedMap.java:24) org.logstash.ConvertedMap$1.visit(ConvertedMap.java:35) org.logstash.ConvertedMap$1.visit(ConvertedMap.java:29) org.jruby.RubyHash.visitLimited(RubyHash.java:689) org.jruby.RubyHash.visitAll(RubyHash.java:674) org.logstash.ConvertedMap.newFromRubyHash(ConvertedMap.java:69) org.logstash.ConvertedMap.newFromRubyHash(ConvertedMap.java:64) org.logstash.Valuefier.lambda$initConverters$12(Valuefier.java:151) org.logstash.Valuefier.convert(Valuefier.java:74) org.logstash.ConvertedMap$1.visit(ConvertedMap.java:35) org.logstash.ConvertedMap$1.visit(ConvertedMap.java:29) org.jruby.RubyHash.visitLimited(RubyHash.java:689) org.jruby.RubyHash.visitAll(RubyHash.java:674) org.logstash.ConvertedMap.newFromRubyHash(ConvertedMap.java:69) org.logstash.ConvertedMap.newFromRubyHash(ConvertedMap.java:64)...