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NSA has asked 21 questions and find answers to 4 problems.

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NSA questions

In ElasticSearch how to check if a field exists that it equals some value, or that the field doesn't exist?
AWS EMR Cluster fails to launch
How do I pass the resulting files from one grep pass to another so that I only grep through the subset with the second pass?
Converting UTF-8 Characters to Upper/Lower case C++
How do I convert a java.util.Map to scala.collection.immutable.Map in Java?
How do I get STL std::string to work with unicode on windows?
Can you make a HTTP PATCH request from Javascript?
What is the Linux equivalent of: MultiByteToWideChar & WideCharToMultiByte?
Kafka Consumer Rebalancing Algorithm
StringUtils.isBlank() vs String.isEmpty()

NSA answers

How to auto scale Amazon DynamoDB throughput?
How to delete all of the topics in ActiveMQ?