My curl query works 

`curl -v -XGET 'http://localhost:9200/entityitem/5/_mget' -d '{"ids" : ["5000027585", "5000027615"]}'`

but when I use the rest client to do GET query

`http://localhost:9200/entityitem/5/_mget?source={"ids" : ["5000027585", "5000027615"]}`

I get the following error

> 
> Failed to derive xcontent from org.elasticsearch.common.bytes.BytesArray@0
> 
> 
>