SearchHit and SearchQuery have properties with incorrect conventions.

SearchHit and SearchQuery have properties beginning with an underscore against conventions.

<ComplexType Name="searchHit">
  <Property Name="contentSource" Type="Edm.String"/>
  <Property Name="hitId" Type="Edm.String"/>
  <Property Name="isCollapsed" Type="Edm.Boolean"/>
  <Property Name="rank" Type="Edm.Int32"/>
  <Property Name="resultTemplateId" Type="Edm.String"/>
  <Property Name="summary" Type="Edm.String"/>
  <Property Name="_id" Type="Edm.String"/>
  <Property Name="_score" Type="Edm.Int32"/>
  <Property Name="_summary" Type="Edm.String"/>
  <NavigationProperty Name="resource" Type="graph.entity" ContainsTarget="true"/>
  <NavigationProperty Name="_source" Type="graph.entity" ContainsTarget="true"/>
</ComplexType>

Its important to note that these properties have been marked deprecated for now and no action may be needed if they end up being removed from the metadata.

<Annotations Target="microsoft.graph.searchHit/_id">
        <Annotation Term="Org.OData.Core.V1.Revisions">
            <Collection>
                <Record>
                    <PropertyValue Property="Date" Date="2021-12-14" />
                    <PropertyValue Property="Description" String="The _id will be removed on December 31, 2022. Use the id instead." />
                    <PropertyValue Property="Kind">
                        <EnumMember>Org.OData.Core.V1.RevisionKind/Deprecated</EnumMember>
                    </PropertyValue>
                    <PropertyValue Property="RemovalDate" Date="2022-12-31" />
                    <PropertyValue Property="Version" String="2021-12/RemoveDeprecatedUnderscoreProperty" />
                </Record>
            </Collection>
        </Annotation>
    </Annotations>
    <Annotations Target="microsoft.graph.searchHit/_score">
        <Annotation Term="Org.OData.Core.V1.Revisions">
            <Collection>
                <Record>
                    <PropertyValue Property="Date" Date="2021-12-14" />
                    <PropertyValue Property="Description" String="The _score will be removed on December 31, 2022. Use the rank instead." />
                    <PropertyValue Property="Kind">
                        <EnumMember>Org.OData.Core.V1.RevisionKind/Deprecated</EnumMember>
                    </PropertyValue>
                    <PropertyValue Property="RemovalDate" Date="2022-12-31" />
                    <PropertyValue Property="Version" String="2021-12/RemoveDeprecatedUnderscoreProperty" />
                </Record>
            </Collection>
        </Annotation>
    </Annotations>
    <Annotations Target="microsoft.graph.searchHit/_summary">
        <Annotation Term="Org.OData.Core.V1.Revisions">
            <Collection>
                <Record>
                    <PropertyValue Property="Date" Date="2021-12-14" />
                    <PropertyValue Property="Description" String="The _summary will be removed on December 31, 2022. Use the summary instead." />
                    <PropertyValue Property="Kind">
                        <EnumMember>Org.OData.Core.V1.RevisionKind/Deprecated</EnumMember>
                    </PropertyValue>
                    <PropertyValue Property="RemovalDate" Date="2022-12-31" />
                    <PropertyValue Property="Version" String="2021-12/RemoveDeprecatedUnderscoreProperty" />
                </Record>
            </Collection>
        </Annotation>
    </Annotations>
    <Annotations Target="microsoft.graph.searchHit/_source">
        <Annotation Term="Org.OData.Core.V1.Revisions">
            <Collection>
                <Record>
                    <PropertyValue Property="Date" Date="2020-09-15" />
                    <PropertyValue Property="Description" String="The _source property is deprecated and will stop supporting on December 15, 2020. Please use the new property resource." />
                    <PropertyValue Property="Kind">
                        <EnumMember>Org.OData.Core.V1.RevisionKind/Deprecated</EnumMember>
                    </PropertyValue>
                    <PropertyValue Property="RemovalDate" Date="2020-12-15" />
                    <PropertyValue Property="Version" String="2020-09/MVP3" />
                </Record>
            </Collection>
        </Annotation>
    </Annotations>