Timestamp parsing issues

I am trying to filter by timestamp but it seems there are parsing issues:
```
50shades  follow   timestamp:["2019-07-23 09:53:08.175" TO "2019-07-23 09:53:08.575"]
Error: 500 Internal Server Error: Unable to perform search query

parse_exception: Encountered " <RANGE_GOOP> "09:53:08.175 "" at line 1, column 22.
Was expecting:
    "TO" ...
```