anchor.diff:      src = fetchurl {
         url = "https://artifacts.elastic.co/downloads/elasticsearch-plugins/${pluginName}/${pluginName}-${esVersion}.zip";
         sha256 =
  -        if version == "7.3.1" then "0kpb1hn2fb4lh6kn96vi7265ign9lwcd0zfc19l4n6fpp8js5lfh"
  +        if version == "7.5.1" then "15g438zpxrcmsgddwmk3sccy92ha90cyq9c61kcw1q84wfi0a7jl"
           else if version == "6.8.3" then "1s2klpvnhpkrk53p64zbga3b66czi7h1a13f58kfn2cn0zfavnbk"
           else throw "unsupported version ${version} for plugin ${pluginName}";
       };
  
positive.code:     src = fetchurl {
        url = "https://artifacts.elastic.co/downloads/elasticsearch-plugins/${pluginName}/${pluginName}-${version}.zip";
        sha256 =
          if version == "7.3.1" then "1p30by7pqnvj8dcwws51kh9s962c42qwqq07gmj4jl83zxcl8kyl"
          else if version == "6.8.3" then "0pmffz761dqjpvmkl7i7xsyw1iyyspqpddxp89rjsznfc9pak5im"
          else throw "unsupported version ${version} for plugin ${pluginName}";
      };
  
negative.code:     src = fetchurl {
        url = "https://artifacts.elastic.co/downloads/elasticsearch-plugins/${pluginName}/${pluginName}-${esVersion}.zip";
        sha256 =
          if version == "7.5.1" then "1j1rgbha5lh0a02h55zqc5qn0mvvi16l2m5r8lmaswp97px056v9"
          else if version == "6.8.3" then "1mm6hj2m1db68n81rzsvlw6nisflr5ikzk5zv9nmk0z641n5vh1x"
          else throw "unsupported version ${version} for plugin ${pluginName}";
      };
  