Document extractor service (#15665)

* Document extractor service

* Fixing vendor modules

* Addressing PR Review comments

* Some small simplifications

* Fixing a linter complain

* simplifying a bit the code using package variables

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

vendor/github.com/dsnet/compress/go.mod

@@ -0,0 +1,10 @@
+module github.com/dsnet/compress
+
+go 1.9
+
+require (
+	github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780
+	github.com/klauspost/compress v1.4.1
+	github.com/klauspost/cpuid v1.2.0 // indirect
+	github.com/ulikunitz/xz v0.5.6
+)