Field named "tags" in logstash event causing problem


Here is what my configuration looks like ...
filter {
mutate {
rename => {
"keywords" => "[tags][keywords]"

Essentially, I'm looking to mutate into a nested JSON under field named "tags".
Now this is leading a very weird result as follows:
"tags" => [
[0] [
[0] "keywords",
[1] "process, new, variable"
I'm guessing this could be cos perhaps logstash treats "tags" as a special keyword. In which case, how do I achieve what I want to ... have a nested JSON under "tags" field?

Any thoughts anyone?

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