Query response is very slow

We have around 19000 documents with 10 fields in each document.One of the field is content which is of type string and stores all the content crawled from file. I need to run full text search on this content field and hence I am using match_phrase_prefix query which is gving vert slow responses of close to 20 seconds for certain words and on an average the response is very slow.Please advice what could be going wrong.
the analyzer for the content field is lowercase +whitespace tokenized.
The test setup is of 1 shard .
Please advice urgently.

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