logstash: update default version to v6

pkgs/tools/misc/logstash/6.x.nix

@@ -1,53 +0,0 @@
-{ elk6Version
-, enableUnfree ? true
-, stdenv
-, fetchurl
-, makeWrapper
-, jre
-}:
-
-with stdenv.lib;
-
-stdenv.mkDerivation rec {
-  version = elk6Version;
-  name = "logstash-${optionalString (!enableUnfree) "oss-"}${version}";
-
-  src = fetchurl {
-    url = "https://artifacts.elastic.co/downloads/logstash/${name}.tar.gz";
-    sha256 =
-      if enableUnfree
-      then "0yx9hpiav4d5z1b52x2h5i0iknqs9lmxy8vmz0wkb23mjiz8njdr"
-      else "1ir8pbq706mxr56k5cgc9ajn2jp603zrqj66dimx6xxf2nfamw0w";
-  };
-
-  dontBuild         = true;
-  dontPatchELF      = true;
-  dontStrip         = true;
-  dontPatchShebangs = true;
-
-  buildInputs = [
-    makeWrapper jre
-  ];
-
-  installPhase = ''
-    mkdir -p $out
-    cp -r {Gemfile*,modules,vendor,lib,bin,config,data,logstash-core,logstash-core-plugin-api} $out
-
-    patchShebangs $out/bin/logstash
-    patchShebangs $out/bin/logstash-plugin
-
-    wrapProgram $out/bin/logstash \
-       --set JAVA_HOME "${jre}"
-
-    wrapProgram $out/bin/logstash-plugin \
-       --set JAVA_HOME "${jre}"
-  '';
-
-  meta = with stdenv.lib; {
-    description = "Logstash is a data pipeline that helps you process logs and other event data from a variety of systems";
-    homepage    = https://www.elastic.co/products/logstash;
-    license     = if enableUnfree then licenses.elastic else licenses.asl20;
-    platforms   = platforms.unix;
-    maintainers = with maintainers; [ wjlroe offline basvandijk ];
-  };
-}