Welcome!
May be the document is not searchable yet because the index has not been refreshed?
You can call:
POST trend_meta/_refresh
Before searching and check if this works.
If not, can you run:
GET trend_meta/_doc/trend9d27baa7-7dbe-4448-891a-814cab9e805f
Where trend9d27baa7-7dbe-4448-891a-814cab9e805f is the id you are searching for.