_source_exclude does not work with msearch and NodeJS client

Greetings,

The following query does not work with msearch and NodeJS client:

{
_type: 'Account',
_source_exclude: ['timestamp', 'mainUserId']
},
{query: {constant_score: {filter: {term: {mainUserId: params.mainUserId}}}}}

I also tried _sourceExclude, _source: {exclude: ...}, and [...].join() with no luck

Regards

Actually source filtering in general does not always work with multi search JavaScript Node API.

No answer? :disappointed_relieved: