square brackets cause exception in a string

[mutt13y]

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

• Version:7.10
• Operating System:centos
• Config File (if you have sensitive info, please remove it): kv with defaults
• Sample Data:

  foo=(string with [ square bracket)

• Steps to Reproduce: Just having the above in a log line causes

Exception while parsing KV {:exception=>"Invalid FieldReference: `[compressionEnabled`"}

the following setting

remove_char_value => "\[\]"

is a workaround but obviously removes the square brackets which is undesirable

[mutt13y]

I was mistaken it is [ in the key name that (rightly) causes the exception.