Query too slow against fulltext index

Hi, I have a question:

I built a full-text index based on the description of the document, but the query was not very fast:
I have 4 million records in dgraph v1.0.9-release ,and I built a fulltext on ‘company_name’ field, and i run the command :

   query(func:anyoftext(company_name, "北京万科"),first:5) {

it used 345 second, it’s too slow. anyone know the reason?

machine: CentOS7 , 8 cores, 32 Mem.

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