Search discover.provider.plex.tv API

Hey guys !
My attempt to make a search give me this response :

<?xml version="1.0"?>
<MediaContainer suggestedTerms="" identifier="tv.plex.provider.discover" size="2">
    <SearchResults id="plex" title="Free On Demand" size="1">
        <SearchResult Metadata="[object Object]" score="0.62" />
    </SearchResults>
    <SearchResults id="external" title="More Ways To Watch" size="5">
        <SearchResult Metadata="[object Object]" score="0.51" />
        <SearchResult Metadata="[object Object]" score="0.5" />
        <SearchResult Metadata="[object Object]" score="0.44" />
        <SearchResult Metadata="[object Object]" score="0.33" />
        <SearchResult Metadata="[object Object]" score="0.3" />
    </SearchResults>
</MediaContainer>

It’s seaching allright from the looks of it but why do I have this quoted Metadata=“[object Object]” ?

I cannot exploit it…

Here’s the query :
/library/search?query=canal street 2018&limit=5&searchTypes=movies&includeMetadata=1

Any idea ?