Search issue with snowball stemmer

Hello everyone,

I have follow index mapping:

and I posted the next content:

When I make this one request:
/http://epbyvitw0052:9200/some_content/docs/_search?q=sampling/

I'm getting result:

but when I send request without type:
/http://epbyvitw0052:9200/some_content/_search?q=sampling/

then I'm getting nothing:

although, I can make the next request with term:
/http://epbyvitw0052:9200/some_content/_search?q=sampl/

the system found it:

It's issue appear when I put snowball filter into analyzer.
Could you explain why the system has such behavior?
May be I do something wrong.

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