quote in storage plugin

[Sungwook Yoon]

I have an apache access log.
It is " " separated '"' quoted string per line.

In the storage plugin, I defined the storage plugin as,
"ssv": {
      "type": "text",
      "extensions": [
        "ssv"
      ],
      "delimiter": " ",
      "quote": "\""
    },

The "quote" field, is accepted but after update on the storage plugin, with
success message, "quote" field disappears.

WHY?

I tried to define the "quote" as "\u0022". Again disappears with success
message.

Then, drill fails to read the data correctly, ignoring the "quoted" value
direction.

What should I do in this case?

Thanks,

Sungwook