Google Search Appliance Connectors Deploying the Connector for SharePoint - Manual (Page 6)

Known connector limitations
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Only one connector instance is allowed per Virtual Server / SharePoint Web
Application.
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The connector requires full read permissions at the Web Application Policy level.
Because this is not feasible when multiple tenants share the same web application,
it might not be possible for the connector to support a multi-tenant configuration.
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The number of content databases will affect document change detection latency.
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The number of unique users and groups used in ACLs for each site collection will
affect memory consumption.
Multi-Tenant configurations
The connector requires full read permissions at the Web Application Policy level. Because
this is not feasible when multiple tenants share the same web application, it might not be
possible for the connector to support a multi-tenant configuration. Multi-Tenant
configurations will be supported in Connectors 4.0.4.