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A Journey of a Thousand Miles Begins with a Single Step

Delete Elasticsearch documents by query in Version 5

To delete documents from an index has changed in Version 5. A little example how to delete documents in Elasticsearch v5.1.x, how to monitor the status and free up the disk space.

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Aggregations in the Elasticsearch Query DSL

A small example how to count documents in Elasticsearch using the Query DSL Aggregations.

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Use Sonarqube for Code Inspection

Sonarqube is a starting point to find flaws in your source code. This post gives an introduction and demonstrates how to exclude false positives.

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Fix timestamp parse failure in Elasticsearch

If you use logstash to send logs to elasticsearch in JSON format, you may experience a _timestampparsefailure for this date format [24/Jan/2017:09:04:07 +0100]. This date format is often used in the access.log e.g. JBoss EAP. To solve that, just add an additional date format pattern into the index template.

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My first TechRadar

At my team kickoff meeting was a small coding session. The main objective is to create a tech-radar. In short, technology radars are a way to assess and evaluate your current work with your technology ecosystem. This is, in my humble opinion, a mandatory tool for knowing what you have and what you need to accomplish or align to the company’s strategy.

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Check your Raspberry Pi model

If you have a Raspberry Pi cluster and a bunch of them, you may have to add or replace some of them. But there is an easy way to check with the shell which model you have. If you query the CPU information you will receive currently 4 CPUs and at the bottom the hardware and revision number.

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Update the firmware of your Raspberry Pi

If you want to update the firmware of your Raspberry Pi, these steps might interest you. This post uses Raspbian as OS. Have a look at Updating and Upgrading Raspbian first.

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Download maven dependency without a pom.xml

Apache Maven relies on dependencies declared in the pom.xml. You could also just use the dependency:get goal to download the artifact.

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The all meta field in Elasticsearch

Are you wondering yourself how Elasticsearch finds the text, that you are searching for? Learn more about the _all meta field.

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