Merge NuGet.Indexing into NuGet.Services.AzureSearch (#739)

Also, remove ILoader abstraction since it is no longer needed
Progress on NuGet/NuGetGallery#7822

NuGet.Services.Metadata.sln

@@ -18,10 +18,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CatalogTests", "tests\Catal
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ng", "src\Ng\Ng.csproj", "{5234D86F-2C0E-4181-AAB7-BBDA3253B4E1}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NuGet.Indexing", "src\NuGet.Indexing\NuGet.Indexing.csproj", "{DDB34145-870F-42C3-9663-A9390CEE1E35}"
-EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NuGet.IndexingTests", "tests\NuGet.IndexingTests\NuGet.IndexingTests.csproj", "{43665489-01F0-4F35-8A33-258F2231B2D8}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NgTests", "tests\NgTests\NgTests.csproj", "{05C1C78A-9966-4922-9065-A099023E7366}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Services", "Services", "{97E23323-BA7A-48F0-A578-858B82B6D8FB}"
@@ -117,28 +113,6 @@ Global
 		{5234D86F-2C0E-4181-AAB7-BBDA3253B4E1}.Release|Mixed Platforms.Build.0 = Release|Any CPU
 		{5234D86F-2C0E-4181-AAB7-BBDA3253B4E1}.Release|x64.ActiveCfg = Release|Any CPU
 		{5234D86F-2C0E-4181-AAB7-BBDA3253B4E1}.Release|x64.Build.0 = Release|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Release|Any CPU.Build.0 = Release|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Release|Mixed Platforms.Build.0 = Release|Any CPU
-		{DDB34145-870F-42C3-9663-A9390CEE1E35}.Release|x64.ActiveCfg = Release|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Debug|x64.Build.0 = Debug|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Release|Any CPU.Build.0 = Release|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Release|Mixed Platforms.Build.0 = Release|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Release|x64.ActiveCfg = Release|Any CPU
-		{43665489-01F0-4F35-8A33-258F2231B2D8}.Release|x64.Build.0 = Release|Any CPU
 		{05C1C78A-9966-4922-9065-A099023E7366}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{05C1C78A-9966-4922-9065-A099023E7366}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{05C1C78A-9966-4922-9065-A099023E7366}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
@@ -387,8 +361,6 @@ Global
 		{E97F23B8-ECB0-4AFA-B00C-015C39395FEF} = {5DE01C58-D5F7-482F-8256-A8333064384C}
 		{4D0B6BAB-5A33-4A7F-B007-93194FC2E2E3} = {F1C83FD9-A498-483E-ADFA-B55D82A14965}
 		{5234D86F-2C0E-4181-AAB7-BBDA3253B4E1} = {C86C6DEE-84E1-4E4E-8868-6755D7A8E0E4}
-		{DDB34145-870F-42C3-9663-A9390CEE1E35} = {5DE01C58-D5F7-482F-8256-A8333064384C}
-		{43665489-01F0-4F35-8A33-258F2231B2D8} = {F1C83FD9-A498-483E-ADFA-B55D82A14965}
 		{05C1C78A-9966-4922-9065-A099023E7366} = {F1C83FD9-A498-483E-ADFA-B55D82A14965}
 		{717E9A81-75C5-418E-92ED-18CAC55BC345} = {5DE01C58-D5F7-482F-8256-A8333064384C}
 		{1745A383-D0BE-484B-81EB-27B20F6AC6C5} = {5DE01C58-D5F7-482F-8256-A8333064384C}

build.ps1

@@ -75,7 +75,6 @@ Invoke-BuildStep 'Restoring solution packages' { `
 
 Invoke-BuildStep 'Set version metadata in AssemblyInfo.cs' {
         $assemblyInfos = `
-            "src\NuGet.Indexing\Properties\AssemblyInfo.g.cs", `
             "src\Catalog\Properties\AssemblyInfo.g.cs", `
             "src\NuGet.ApplicationInsights.Owin\Properties\AssemblyInfo.g.cs", `
             "src\Ng\Properties\AssemblyInfo.g.cs", `
@@ -115,7 +114,6 @@ Invoke-BuildStep 'Signing the binaries' {
 
 Invoke-BuildStep 'Creating artifacts' {
         $csprojPackages = `
-            "src\NuGet.Indexing\NuGet.Indexing.csproj", `
             "src\Catalog\NuGet.Services.Metadata.Catalog.csproj", `
             "src\NuGet.ApplicationInsights.Owin\NuGet.ApplicationInsights.Owin.csproj", `
             "src\NuGet.Services.Metadata.Catalog.Monitoring\NuGet.Services.Metadata.Catalog.Monitoring.csproj", `

src/Catalog/Helpers/Retry.cs

@@ -10,7 +10,6 @@ namespace NuGet.Services.Metadata.Catalog.Helpers
     /// Can (and probably should) be replaced with Polly library if the project is updated to target .netfx 4.7.2.
     /// In current state Polly pulls a ton of System.* dependencies which we previously didn't have.
     /// </remarks>
-    /// <seealso cref="NuGet.Indexing.Retry"/>
     public class Retry
     {
         /// <summary>

src/Ng/Ng.csproj

@@ -107,10 +107,6 @@
       <Project>{e97f23b8-ecb0-4afa-b00c-015c39395fef}</Project>
       <Name>NuGet.Services.Metadata.Catalog</Name>
     </ProjectReference>
-    <ProjectReference Include="..\NuGet.Indexing\NuGet.Indexing.csproj">
-      <Project>{ddb34145-870f-42c3-9663-a9390cee1e35}</Project>
-      <Name>NuGet.Indexing</Name>
-    </ProjectReference>
     <ProjectReference Include="..\NuGet.Jobs.Catalog2Registration\NuGet.Jobs.Catalog2Registration.csproj">
       <Project>{5ABE8807-2209-4948-9FC5-1980A507C47A}</Project>
       <Name>NuGet.Jobs.Catalog2Registration</Name>