PE_Multiple_Executions_Child: This is a simple child pipeline that writes out a document with a static string and the number of input documents received by Snap.

PE_Multiple_Executions_NoReuse_Parent: This parent pipeline executes the PE_Multiple_Executions_Child Pipeline five times. You can save the Pipeline to examine the output documents. Note that the output contains a copy of the original document, and the $inCount field is always set to one because the Pipeline was separately executed five times.

PE_Multiple_Executions_Reuse_Parent: This parent Pipeline executes the PE_Multiple_Executions_Child Pipeline once and feeds the child Pipeline execution five documents. You can save the Pipeline to examine the output documents. Note that the output does not contain a copy of the original document, and the $inCount field goes up for each document because the same Snap instance is being used to process each document.

PE_Multiple_Executions_UltraSplitAggregate_Parent: This parent Pipeline is an example of using Snaps that are not Ultra-compatible in an Ultra Pipeline. It can be turned into an Ultra Pipeline by removing the JSON Generator Snap at the head of the Pipeline and creating an Ultra Task.

PE_Multiple_Executions_UltraSplitAggregate_Child: A child Pipeline that splits an array field in the input document and sums the values of the $num field in the resulting documents.