<PackageReference Include="Relativity.Server.Services.Interfaces.SDK" Version="5000.0.2" />

Relativity.Services.Objects.DataContracts.SearchProviderCondition

Contains the parameters used to execute a query through a search provider.
public string Input { get; set; }

Gets or sets a string containing the parameters used for a search provider, which were entered by a user.

public SearchIndexRef SearchIndex { get; set; }

Gets or sets the Artifact ID of the search provider.