Mapping parse error

I am receiving the following erorr in ES and i dont know what type object really means in this case. our field has been coming in as a string since the beginning,

like this, "time":"1524355464692"

here is the error,

org.elasticsearch.index.mapper.MapperParsingException: object mapping for [time] tried to parse field [time] as object, but found a concrete value

Probably because you sent previously something like

time : { ... }

Have a look at your current mapping and you'll see that time is an object and probably has sub fields.