ShingleFilter produces invalid queries

[tohidemyname]

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Summary of the changes (Less than 80 chars)

Fixes #{bug number} (in this specific format)
#943

Description

{Detail}

[paulirwin]

@tohidemyname Thanks, also, for this PR!

This appears to be a fairly faithful port of this fix in Lucene 6.5: apache/lucene@57a42e4

Just like #947, we'll need to polish a couple things to our conventions like the test name. I'll do that work as part of merging.

cc @NightOwl888