ElasticsearchQueries.fromJson expects JSON like this:

{ 'query': <the query> }

... instead of just the query. Providing different JSON will result in `ElasticsearchHSQuery` generating invalid JSON.

But the fact we force users to provide the "

" wrapping will probably make them think they can provide other parameters that are specific to the search API, such as "from"/"size", "sort" "explain", "inner hits", and so on.

We should either:

• change the contract for this method and expect the actual query JSON
• keep the " {query: ... }

  " wrapping and throw exception when there is any other root-level property

• keep the " {query: ... }

  " wrapping and only allow a select few options (custom aggregations in particular), throwing an exception for others