elasticsearch

my personal notes on Elasticsearch, a Java thing consumed from a .NET context

Elasticsearch is a highly scalable open-source full-text search and analytics engine. It allows you to store, search, and analyze big volumes of data quickly and in near real time. It is generally used as the underlying engine/technology that powers applications that have complex search features and requirements. [docs]

Windows install, Chocolatey flavored

Install Chocolatey package, jdk8 and make sure JAVA_HOME is correct. Based on what is on the downloads page as of this writing, download the Elasticsearch Zip and extract:

Invoke-WebRequest -Uri https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.6.0.zip

Add elasticsearch-6.6.0/bin to PATH and run elasticsearch. By the current convention, the server should be at http://localhost:9200/:

{
    "name": "_RzHa2s",
    "cluster_name": "elasticsearch",
    "cluster_uuid": "Qjz1mRRIS9uDLxtRK776Ug",
    "version": {
        "number": "6.6.0",
        "build_flavor": "default",
        "build_type": "zip",
        "build_hash": "a9861f4",
        "build_date": "2019-01-24T11:27:09.439740Z",
        "build_snapshot": false,
        "lucene_version": "7.6.0",
        "minimum_wire_compatibility_version": "5.6.0",
        "minimum_index_compatibility_version": "5.0.0"
    },
    "tagline": "You Know, for Search"
}

Windows install, bash flavored

In case frustration is found with my previous installation approach, you can get into more trouble by not only installing Elasticsearch in the Windows Subsystem for Linux but also using the Amazon-backed Open Distro for Elasticsearch as well😬. There is documentation for the Debian installation process and my variation for version 7.1.1 is only slightly different:

sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt update
sudo apt install openjdk-11-jdk

Ensure that JAVA_HOME is set by editing /etc/environment with a line like:

JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64/"

where java-11-openjdk-amd64 is a symlink. For more detail, see “How to set JAVA_HOME for Java?.”📚

wget -qO - https://d3g5vo6xdbdb9a.cloudfront.net/GPG-KEY-opendistroforelasticsearch | sudo apt-key add -

echo "deb https://d3g5vo6xdbdb9a.cloudfront.net/apt stable main" | sudo tee -a   /etc/apt/sources.list.d/opendistroforelasticsearch.list

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-7.1.1-amd64.deb
sudo dpkg -i elasticsearch-oss-7.1.1-amd64.deb

sudo apt-get update
sudo apt install opendistroforelasticsearch

Disable all security on the server by editing /etc/elasticsearch/elasticsearch.yml with these two lines:

opendistro_security.ssl.http.enabled: false
…
opendistro_security.disabled: true

For more detail, see “Disable security.”📚

Finally, because systemctl is not really a thing in Windows bash, control the elasticsearch service with these:

sudo /etc/init.d/elasticsearch restart
sudo /etc/init.d/elasticsearch stop
sudo /etc/init.d/elasticsearch start

—otherwise, for Linux:

sudo systemctl start elasticsearch.service
systemctl status elasticsearch.service
sudo systemctl stop elasticsearch.service

Verify that the server is running (and unsecured) with these commands:

curl -XGET https://localhost:9200 -u admin:admin --insecure
curl -XGET https://localhost:9200/_cat/nodes?v -u admin:admin --insecure
curl -XGET https://localhost:9200/_cat/plugins?v -u admin:admin --insecure

Elasticsearch is explored through tests

Under the ElasticSearch.Tests/ directory will be subdirectories representing the study of official guides.

• my study of the Getting Started guide

the unmet dependencies error

The unmet dependencies error comes from installing opendistroforelasticsearch with a version number that is not the same as the version of the packages used with the dpkg command. This issue is detailed on GitHub.

The information in this article might do well here: “How to uninstall a .deb package? ”

@BryanWilhite