aggregate fails to map to any kind of object

[Willie Slepecki]

So with this method (hard coded for the example)

 def findHistoryList(String link_value) {

    String sFirst = """

[

  {

    \$project: {

      created_by_name: '\$record_revision.created_by_name',

      obsoleted_by_name: '\$record_revision.obsoleted_by_name'

    }

  }

]

"""

    String sSecond = """

{

  \$match: {

    link_value: 'ec5b022a'

  }

}

"""

    log.debug(sFirst)

    log.debug(sSecond)

    def g = inventory.aggregate(sFirst)

        .and(sSecond)

        //.as(HistoryList.class)

  }

If i leave the 'as' operator commented out, this method does return and 'g' is of a type aggregate something.  i cant really figure it out.  But, if i uncomment 'as' and i put anything in there from my pojo to just Map.class (this method happens to be the only thing in my application that isn't a Map<String, Object> and thats simply because this is the first that requires me to deal with the _id field) i get the following error

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is com.mongodb.MongoCommandException: Command failed with error 40324: 'Unrecognized pipeline stage name: '0'' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "Unrecognized pipeline stage name: '0'", "code" : 40324, "codeName" : "Location40324" }

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]

Now, i tried to register jackson with the DB connection with this

  @Autowired

  InventoryDao(DB rufusdb){

    this.rufusdb = rufusdb

    Jongo jongo = new Jongo(this.rufusdb,

        new JacksonMapper.Builder()

            .registerModule(new JodaModule())

            .enable(MapperFeature.AUTO_DETECT_GETTERS)

//            .withView(Views.Public.class)

            .build()

    )

    inventory = jongo.getCollection("inventory")

  }

i don't get any errors on it, but it also has no effect.  

    compile "org.mongodb:mongo-java-driver:3.4.2"

    compile 'org.jongo:jongo:1.3.0'

are my versions