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Having chat rooms for specific topics or projects have become quite popular. IMHO it is a nice addon for development and deployment lifecycle management. HipChat or Slack are some popular providers. If you want to have an internal chat system, letschat is a quick way to accomplish that. It has some flaws, debugging LDAP was a horror, but basically is good enough in its vanilla state. Take as it is and its free (MIT License). We use it currently for receiving notifications from our continuous integration system.

OpenSSL provides the capability to read and output in various formats.

Heartbeat is still beta, but is worth a try. If you have an external REST endpoint and you need a history to check if the endpoint is available, heartbeat is one eligible solution.

The Elasticsearch Reindex API is a powerful way to index a subset of data from existing data. If you think of a long term statistics solution, you can aggregate data and store the aggregated values instead the atomic details. In my company we have an index that contains approximately 150 fields in each document. For a longterm solution only 30 are relevant. The Reindex API can just fetch the 30 desired fields and store them in a new index.

An accident in the Elasticsearch universe. Instead writing to an daily index it was index to a yearly index. Now I had to check the date range of the documents. The Elasticsearch Date Math is a great help for the Range Query.

If you are using Lombok you can let lombok generate via the Maven Plugin the source code.

Another way to minify JSON is to use the npm package.

json2csv is java script library which allows conversion of the format csv and json on a linux terminal.

Temporary tables exist in a special schema. If specified in the create table statement, the table is created as a temporary table. Temporary tables are automatically dropped at the end of a session, or optionally at the end of the current transaction. .. Any indexes created on a temporary table are automatically temporary as well.