Elasticsearch

A quick summary of Elasticsearch

Installation for Debian

https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html

sudo apt-get install openjdk-8-jdk
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
sudo apt-get install apt-transport-https
echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list
sudo apt-get update && sudo apt-get install elasticsearch

Running

부팅 시 자동으로 실행되도록 등록하기
sudo update-rc.d elasticsearch defaults 95 10

수동으로 시작, 중지, 재시작

sudo -i service elasticsearch stop
sudo -i service elasticsearch restart

Connection Test

> curl localhost:9200
{
"name" : "hSTZhNF",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "TyaNhlw7QUGTjT0l8NIYXQ",
"version" : {
"number" : "6.1.1",
"build_hash" : "bd92e7f",
"build_date" : "2017-12-17T20:23:25.338Z",
"build_snapshot" : false,
"lucene_version" : "7.1.0",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}

Plugin Management

/usr/share/elasticsearch/bin/elasticsearch-plugin

X-pack

https://www.elastic.co/guide/en/elasticsearch/reference/6.2/installing-xpack-es.html

sudo bin/elasticsearch-plugin install x-pack

Eunjeon

# https://bitbucket.org/eunjeon/seunjeon/raw/master/elasticsearch/
bash <(curl -s https://bitbucket.org/eunjeon/seunjeon/raw/master/elasticsearch/scripts/downloader.sh) -e 6.1.1 -p 6.0.0.1
sudo bin/elasticsearch-plugin install file://`pwd`/elasticsearch-analysis-seunjeon-6.0.0.1.zip

Tutorial

Index

Create Index

curl -XPUT 'localhost:9200/new-index?pretty'
{
"acknowledged" : true,
"shards_acknowledged" : true,
"index" : "new-index"
}

Delete Index

curl -XDELETE 'localhost:9200/new-index?pretty'
{
"acknowledged" : true
}

Mapping

curl 'localhost:9200/new-index/_mapping/group?pretty'

GET /_search

GET /index/_search

GET /index/type/_search

POST /_search
{
"query": { ... }
}

match_all

GET /_search
{
"query": {"match_all": {}}
}

match

GET /_search
{
"query": {"match": {"field_name": "키워드"}}
}

Select the Output

GET /_search
{
"fields" : ["field_name_0", "field_name_1"],
"query" : {
"term" : {"field_name_0": "키워드"}
}
}

Pagination

GET /_search
{
"from": 0,
"size": 10,
"query" : {
"term" : {"field_name_0": "키워드"}
}
}

Sorting

GET /_search
{
"sort": [
{"date_0": {"order": "asc""}},
{"date_1": {"order": "desc""}},
"_score"
],
"query" : {
"term" : {"field_name_0" : "키워드"}
}
}

Highlight

GET /_search
{
"query": {
"match": {
"field_name_0": "키워드"
}
},
"highlight": {
"fields": {
"field_name_0": {}
}
}
}