Receiving erro r'Request size is too large' when querying Cosmos DB.

While running a query against my database and getting a 'Request size is too large' while iterating through the results:

The query is 'select c.id, c.snippet.channelId from c where (c.kind = 'youtube#channel' or c.kind = 'youtube#video') and c.statistics.commentCount > 0'

Stack Trace:

java.util.concurrent.ExecutionException: java.lang.IllegalStateException: com.microsoft.azure.documentdb.DocumentClientException: {'Errors':['Request size is too large']}
ActivityId: 00000000-0000-0000-0000-000000000000, Request URI: //, StatusCode: RequestEntityTooLarge, SubStatusCode:
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at com.affinio.work.Worker$class.waitUntilDone(Worker.scala:51)
at com.affinio.scanner.CommentScan$.waitUntilDone(CommentScan.scala:11)
at com.affinio.work.Worker$class.cleanUp(Worker.scala:87)
at com.affinio.scanner.CommentScan$.com$affinio$reader$Reader$$super$cleanUp(CommentScan.scala:11)
at com.affinio.reader.Reader$class.cleanUp(Reader.scala:147)
at com.affinio.scanner.CommentScan$.cleanUp(CommentScan.scala:11)
at com.affinio.work.Worker$class.main(Worker.scala:105)
at com.affinio.scanner.CommentScan$.main(CommentScan.scala:11)
at com.affinio.scanner.CommentScan.main(CommentScan.scala)
Caused by: java.lang.IllegalStateException: com.microsoft.azure.documentdb.DocumentClientException: {'Errors':['Request size is too large']}

Once the item is already on the database the error should not be related to document size.

首先，在反覆處理結果時重現提供的 Cosmos DB 查詢，並透過 Worker.scala、CommentScan.scala 和 Reader.scala 對照 stack trace 比較該失敗。確定為什麼現有的資料庫項目會產生 RequestEntityTooLarge，讓該錯誤可以重現，並驗證查詢能在不發生要求大小失敗的情況下完成。

由索引模型根據 Issue 內容生成。