anchor.diff:      src = fetchurl {
         url = "https://artifacts.elastic.co/downloads/elasticsearch-plugins/${pluginName}/${pluginName}-${version}.zip";
         sha256 =
  -        if version == "7.3.1" then "1p30by7pqnvj8dcwws51kh9s962c42qwqq07gmj4jl83zxcl8kyl"
  +        if version == "7.5.1" then "09wl2bpng4xx384xns960rymnm64b5zn2cb1sp25n85pd0isp4p2"
           else if version == "6.8.3" then "0pmffz761dqjpvmkl7i7xsyw1iyyspqpddxp89rjsznfc9pak5im"
           else throw "unsupported version ${version} for plugin ${pluginName}";
       };
  
positive.code:     src = fetchurl {
        url = "https://artifacts.elastic.co/downloads/elasticsearch-plugins/${pluginName}/${pluginName}-${esVersion}.zip";
        sha256 =
          if version == "7.3.1" then "1dqd3hd8qa1bsvd1p42k5zcrdmb66d2yspfc7g8nsz89w6b1invg"
          else if version == "6.8.3" then "1mm6hj2m1db68n81rzsvlw6nisflr5ikzk5zv9nmk0z641n5vh1x"
          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 "15g438zpxrcmsgddwmk3sccy92ha90cyq9c61kcw1q84wfi0a7jl"
          else if version == "6.8.3" then "1s2klpvnhpkrk53p64zbga3b66czi7h1a13f58kfn2cn0zfavnbk"
          else throw "unsupported version ${version} for plugin ${pluginName}";
      };
  