Github user MikeThomsen commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2448#discussion_r190665372
  
    --- Diff: 
nifi-nar-bundles/nifi-mongodb-bundle/nifi-mongodb-processors/src/main/java/org/apache/nifi/processors/mongodb/GetMongo.java
 ---
    @@ -51,14 +53,22 @@
     import java.text.SimpleDateFormat;
     import java.util.ArrayList;
     import java.util.Collections;
    +import java.util.HashMap;
     import java.util.HashSet;
     import java.util.List;
    +import java.util.Map;
     import java.util.Set;
     
     
     @Tags({ "mongodb", "read", "get" })
     @InputRequirement(Requirement.INPUT_FORBIDDEN)
     @CapabilityDescription("Creates FlowFiles from documents in MongoDB")
    +@WritesAttributes( value = {
    +    @WritesAttribute(attribute = "progress.estimate", description = "The 
estimated total documents that match the query. Written if estimation is 
enabled."),
    +    @WritesAttribute(attribute = "progress.segment.start", description = 
"Where the first part of the segment is in the total result set. Written if 
estimation is enabled."),
    +    @WritesAttribute(attribute = "progress.segment.end", description = 
"Where the last part of the segment is in the total result set. Written if 
estimation is enabled."),
    +    @WritesAttribute(attribute = "progress.index", description = "When 
results are written one-by-one to flowfiles, this is is set to indicate 
estimated progress. Written if estimation is enabled.")
    --- End diff --
    
    Done.


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