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elasticsearch basics
workshop
mathieu Elie at giroll
mardi 17 décembre 13
speaker : @mathieuel
• freelance & founder @oneplaylist
• full stack skills
• see what i’ve done on http://www.mathieuelie...
goal
• go from first steps
• and get over first frustation
• give the you the power needed to learn by
yourself

mardi 17 dé...
install
• be sure you have java runtime
• apt-get install openjdk-6-jre-headless -y
• consider oracle jvm

mardi 17 décemb...
unzip and run !
## Get the latest stable archive
wget https://download.elasticsearch.org/elasticsearch/
elasticsearch/elas...
its alive !
[2013-12-13 15:45:25,187][INFO ][node
] [Bridge, George Washington]
version[0.90.7], pid[37998], build[36897d0...
ping es on port 9200
curl http://127.0.0.1:9200
{
"ok" : true,
"status" : 200,
"name" : "Gideon, Gregory",
"version" : {
"...
Store a Document
curl -XPUT http://localhost:9200/workshop/site/1 -d '
{
"url": "http://www.elasticsearch.org",
"title": "...
retreive the document
curl -XGET http://localhost:9200/workshop/site/1
{"_index":"workshop","_type":"site","_id":"1","_ver...
add more documents
curl -XPUT http://localhost:9200/workshop/site/2 -d '
{
"url": "http://www.mathieu-elie.net",
"title": ...
now search !

mardi 17 décembre 13
curl 'http://localhost:9200/workshop/_search?pretty=true'
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 5,
"s...
ok great, but now i
want to search for
text !
mardi 17 décembre 13
step 1 : pass query as a
request body
curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d
'{
"query" ...
It returns all documents
because we use the match all query
http://www.elasticsearch.org/guide/en/elasticsearch/
reference...
match_all query is part of the queries dsl
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/query-ds...
so lets use the
query_string query dsl
curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d '{
"query"...
result is a a quiet
verbose lets get only
title and tags fields
curl -XPOST 'http://localhost:9200/workshop/site/_search?pr...
{
"took" : 6,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"failed" : 0
},
"hits" : {
"total" : 2,
"m...
lets go for facets on tags !!
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/search-facets.html

d...
Facets dsl
curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d '{
"fields" : ["title", "tags"],
"quer...
"facets" : {
"tags" : {
"_type" : "terms",
"missing" : 0,
"total" : 7,
"other" : 0,
"terms" : [ {
"term" : "elasticsearch"...
• hey ! see "Open Source" !

it is lower cased
and exploded in multiple tokens !

• this is done by the defautl mapping an...
curl 'http://localhost:9200/workshop/site/_mapping?pretty=true'
{
"site" : {
"properties" : {
"description" : {
"type" : "...
• tags is a type of string and we have a default
analyzer

• http://www.elasticsearch.org/guide/en/

elasticsearch/referen...
test the default analyzer
curl -XGET 'localhost:9200/workshop/_analyze?pretty=true' -d 'Open Source'
{
"tokens" : [ {
"tok...
• what about keyword analyzer ?
• http://www.elasticsearch.org/guide/en/

elasticsearch/reference/current/analysiskeyword-...
curl -XGET 'localhost:9200/workshop/_analyze?
analyzer=keyword&pretty=true' -d 'Open Source'
{
"tokens" : [ {
"token" : "O...
curl
{

'http://localhost:9200/workshop/site/_mapping?pretty=true' -d '
"site" : {
"properties" : {
"url" : {"type" : "str...
curl -XDELETE 'http://localhost:9200/workshop/'
{"ok":true,"acknowledged":true}%
# index should exists if we want to put m...
# test on the field analysis
curl -XGET 'localhost:9200/workshop/_analyze?
pretty=true&field=site.tags' -d 'Open Source'
{...
# lets push data again
curl -XPUT http://localhost:9200/workshop/site/1 -d '
{
"url": "http://www.elasticsearch.org",
"tit...
# faceting ok ???
curl -XPOST 'http://localhost:9200/workshop/site/_search?
pretty=true' -d '{
"fields" : ["title", "tags"...
"facets" : {
"tags" : {
"_type" : "terms",
"missing" : 0,
"total" : 5,
"other" : 0,
"terms" : [ {
"term" : "elasticsearch"...
if want only docs with "Open Source" tag
we use filters
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/curr...
curl -XGET 'http://localhost:9200/workshop/site/_search?
pretty=true' -d '{
"query" : {
"match_all" : { }
},
"filter" : {
...
RTFM WAY
• elasticsearch doc is great
• but it is exhaustive
• so at the beguining its a bit frustrating

mardi 17 décembr...
Think about json
hierachy
curl -XPOST 'http://localhost:9200/workshop/site/_search?
pretty=true' -d '{
"fields" : ["title"...
your hitting the search api
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/search-search.html
curl...
your using the query dsl
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/query-dsl.html
curl -XPOST...
your using different types of queries
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/query-dsl-que...
this query is a query_string type
with a query parameter set to elasticsearch
http://www.elasticsearch.org/guide/en/elasti...
we also use faceting
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/search-facets.html
curl -XPOST...
we use a terms facet
http://www.elasticsearch.org/guide/en/elasticsearch/
reference/current/search-facets-terms-facet.html...
RTFM WAY
• common mistake: the code example are
not showing always whole query

• so you should replace the code in the do...
the end for me...

the begguining for you...
mardi 17 décembre 13
questions and more
• twitter @mathieuel
• contact on my freelance website
• http://www.mathieu-elie.net
• thanks to giroll...
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elasticsearch basics workshop

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Quick install of elasticsearch, put documents, request, set a mapping and prepare yourself to read the doc !

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Transcript of "elasticsearch basics workshop"

  1. 1. elasticsearch basics workshop mathieu Elie at giroll mardi 17 décembre 13
  2. 2. speaker : @mathieuel • freelance & founder @oneplaylist • full stack skills • see what i’ve done on http://www.mathieuelie.net mardi 17 décembre 13
  3. 3. goal • go from first steps • and get over first frustation • give the you the power needed to learn by yourself mardi 17 décembre 13
  4. 4. install • be sure you have java runtime • apt-get install openjdk-6-jre-headless -y • consider oracle jvm mardi 17 décembre 13
  5. 5. unzip and run ! ## Get the latest stable archive wget https://download.elasticsearch.org/elasticsearch/ elasticsearch/elasticsearch-0.90.7.zip ## Extract the archive unzip elasticsearch-0.90.7.zip cd elasticsearch-0.90.7 ## run ! # This will run elasticsearch on foreground. ./bin/elasticsearch -f mardi 17 décembre 13
  6. 6. its alive ! [2013-12-13 15:45:25,187][INFO ][node ] [Bridge, George Washington] version[0.90.7], pid[37998], build[36897d0/2013-11-13T12:06:54Z] [2013-12-13 15:45:25,189][INFO ][node ] [Bridge, George Washington] initializing ... [2013-12-13 15:45:25,202][INFO ][plugins ] [Bridge, George Washington] loaded [], sites [] [2013-12-13 15:45:28,342][INFO ][node ] [Bridge, George Washington] initialized [2013-12-13 15:45:28,342][INFO ][node ] [Bridge, George Washington] starting ... [2013-12-13 15:45:28,491][INFO ][transport ] [Bridge, George Washington] bound_address {inet[/0:0:0:0:0:0:0:0:9300]}, publish_address {inet[/192.168.1.12:9300]} [2013-12-13 15:45:31,545][INFO ][cluster.service ] [Bridge, George Washington] new_master [Bridge, George Washington][pKCdh1b_TP2TlurO1gm4_g][inet[/192.168.1.12:9300]], reason: zen-disco-join (elected_as_master) [2013-12-13 15:45:31,577][INFO ][discovery ] [Bridge, George Washington] elasticsearch/pKCdh1b_TP2TlurO1gm4_g [2013-12-13 15:45:31,595][INFO ][http ] [Bridge, George Washington] bound_address {inet[/0:0:0:0:0:0:0:0:9200]}, publish_address {inet[/192.168.1.12:9200]} [2013-12-13 15:45:31,596][INFO ][node ] [Bridge, George Washington] started [2013-12-13 15:45:31,629][INFO ][gateway ] [Bridge, George Washington] recovered [0] indices into cluster_state mardi 17 décembre 13
  7. 7. ping es on port 9200 curl http://127.0.0.1:9200 { "ok" : true, "status" : 200, "name" : "Gideon, Gregory", "version" : { "number" : "0.90.6", "build_hash" : "e2a24efdde0cb7cc1b2071ffbbd1fd874a6d8d6b", "build_timestamp" : "2013-11-04T13:44:16Z", "build_snapshot" : false, "lucene_version" : "4.5.1" }, "tagline" : "You Know, for Search" }% mardi 17 décembre 13
  8. 8. Store a Document curl -XPUT http://localhost:9200/workshop/site/1 -d ' { "url": "http://www.elasticsearch.org", "title": "Open Source Distributed Real Time Search & Analytics", "description": "Elasticsearch is a powerful open source search and analytics engine that makes data easy to explore.", "tags": ["Open Source", "elasticsearch", "Distributed"] }' {"ok":true,"_index":"workshop","_type":"sites","_id":"1","_version":1}% mardi 17 décembre 13
  9. 9. retreive the document curl -XGET http://localhost:9200/workshop/site/1 {"_index":"workshop","_type":"site","_id":"1","_version":2,"exists":true, "_source" : { "url": "http://www.elasticsearch.org", "title": "Open Source Distributed Real Time Search & Analytics", "description": "Elasticsearch is a powerful open source search and analytics engine that makes data easy to explore.", "tags": ["Open Source", "elasticsearch", "Distributed"] }}% mardi 17 décembre 13
  10. 10. add more documents curl -XPUT http://localhost:9200/workshop/site/2 -d ' { "url": "http://www.mathieu-elie.net", "title": "Mathieu ELIE Freelance - Full Stack Data Engineer, Data Visualization", "description": "Freelance Consultant in Bordeaux, System & Software Architect. Love dataviz, redis, elasticsearch, architecture scalability recipes and playing with data.", tags: ["elasticsearch", "Data Visualization"] }' curl -XPUT http://localhost:9200/workshop/site/3 -d ' { "url": "http://www.giroll.org", "title": "Collectif Giroll - Gironde Logiciels Libres", "description": "Giroll, collectif bas√é √à Bordeaux, r√éunis autour des Logiciels et des Cultures libres. Ateliers tous les mardis de 18h30 √à 20h30 et organisation d''Install Party Linux tous les six", tags: ["Open Source", "Collectif"] }' mardi 17 décembre 13
  11. 11. now search ! mardi 17 décembre 13
  12. 12. curl 'http://localhost:9200/workshop/_search?pretty=true' { "took" : 1, "timed_out" : false, "_shards" : { "total" : 5, "successful" : 5, "failed" : 0 }, "hits" : { "total" : 3, "max_score" : 1.0, "hits" : [ { "_index" : "workshop", "_type" : "site", "_id" : "1", "_score" : 1.0, "_source" : { "url": "http://www.elasticsearch.org", "title": "Open Source Distributed Real Time Search & Analytics", "description": "Elasticsearch is a powerful open source search and analytics engine that makes data easy to explore.", "tags": ["Open Source", "elasticsearch", "Distributed"] } }, { "_index" : "workshop", "_type" : "site", "_id" : "3", "_score" : 1.0, "_source" : { "url": "http://www.giroll.org", "title": "Collectif Giroll - Gironde Logiciels Libres", "description": "Giroll, collectif bas√é √à Bordeaux, r√éunis autour des Logiciels et des Cultures libres. Ateliers tous les mardis de 18h30 √à 20h30 et organisation mardi 17 décembre 13 dInstall Party Linux tous les six",
  13. 13. ok great, but now i want to search for text ! mardi 17 décembre 13
  14. 14. step 1 : pass query as a request body curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d '{ "query" : { "match_all" : { } } }' mardi 17 décembre 13
  15. 15. It returns all documents because we use the match all query http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/query-dsl-match-all-query.html mardi 17 décembre 13
  16. 16. match_all query is part of the queries dsl http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/query-dsl-queries.html mardi 17 décembre 13
  17. 17. so lets use the query_string query dsl curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d '{ "query" : { "query_string" : { "query" : "elasticsearch" } } }' mardi 17 décembre 13
  18. 18. result is a a quiet verbose lets get only title and tags fields curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } } }' mardi 17 décembre 13
  19. 19. { "took" : 6, "timed_out" : false, "_shards" : { "total" : 5, "successful" : 5, "failed" : 0 }, "hits" : { "total" : 2, "max_score" : 0.081366636, "hits" : [ { "_index" : "workshop", "_type" : "site", "_id" : "1", "_score" : 0.081366636, "fields" : { "tags" : [ "Open Source", "elasticsearch", "Distributed" ], "title" : "Open Source Distributed Real Time Search & Analytics" } }, { "_index" : "workshop", "_type" : "site", "_id" : "2", "_score" : 0.06780553, "fields" : { "tags" : [ "elasticsearch", "Data Visualization" ], "title" : "Mathieu ELIE Freelance - Full Stack Data Engineer, Data Visualization" } mardi 17 décembre 13
  20. 20. lets go for facets on tags !! http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/search-facets.html do you see the wall ??? ;) mardi 17 décembre 13
  21. 21. Facets dsl curl -XPOST 'http://localhost:9200/workshop/site/_search?pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  22. 22. "facets" : { "tags" : { "_type" : "terms", "missing" : 0, "total" : 7, "other" : 0, "terms" : [ { "term" : "elasticsearch", "count" : 2 }, { "term" : "visualization", "count" : 1 }, { "term" : "source", "count" : 1 }, { "term" : "open", "count" : 1 }, { "term" : "distributed", "count" : 1 }, { "term" : "data", "count" : 1 } ] } } mardi 17 décembre 13 ho no!!
  23. 23. • hey ! see "Open Source" ! it is lower cased and exploded in multiple tokens ! • this is done by the defautl mapping and analyzer mardi 17 décembre 13
  24. 24. curl 'http://localhost:9200/workshop/site/_mapping?pretty=true' { "site" : { "properties" : { "description" : { "type" : "string" }, "tags" : { "type" : "string" }, "title" : { "type" : "string" }, "url" : { "type" : "string" } } } } mardi 17 décembre 13
  25. 25. • tags is a type of string and we have a default analyzer • http://www.elasticsearch.org/guide/en/ elasticsearch/reference/current/analysisstandard-analyzer.html • An analyzer of type standard is built using the Standard Tokenizer with the Standard Token Filter, Lower Case Token Filter, and Stop Token Filter. mardi 17 décembre 13
  26. 26. test the default analyzer curl -XGET 'localhost:9200/workshop/_analyze?pretty=true' -d 'Open Source' { "tokens" : [ { "token" : "open", "start_offset" : 0, "end_offset" : 4, "type" : "<ALPHANUM>", "position" : 1 }, { "token" : "source", "start_offset" : 5, "end_offset" : 11, "type" : "<ALPHANUM>", "position" : 2 } ] } mardi 17 décembre 13
  27. 27. • what about keyword analyzer ? • http://www.elasticsearch.org/guide/en/ elasticsearch/reference/current/analysiskeyword-analyzer.html mardi 17 décembre 13
  28. 28. curl -XGET 'localhost:9200/workshop/_analyze? analyzer=keyword&pretty=true' -d 'Open Source' { "tokens" : [ { "token" : "Open Source", "start_offset" : 0, "end_offset" : 11, "type" : "word", "position" : 1 } ] } got it ! now how to apply this to our tags field ? mardi 17 décembre 13
  29. 29. curl { 'http://localhost:9200/workshop/site/_mapping?pretty=true' -d ' "site" : { "properties" : { "url" : {"type" : "string"}, "title" : {"type" : "string"}, "description" : {"type" : "string"}, "tags" : {"type" : "string", "analyzer": "keyword" } } } } ' { "error" : "MergeMappingException[Merge failed with failures {[mapper [tags] has different index_analyzer]}]", "status" : 400 } oops ! we need to drop something.. mardi 17 décembre 13
  30. 30. curl -XDELETE 'http://localhost:9200/workshop/' {"ok":true,"acknowledged":true}% # index should exists if we want to put mapping.. curl -XPUT 'http://localhost:9200/workshop/' {"ok":true,"acknowledged":true}% curl { 'http://localhost:9200/workshop/site/_mapping?pretty=true' -d ' "site" : { "properties" : { "url" : {"type" : "string"}, "title" : {"type" : "string"}, "description" : {"type" : "string"}, "tags" : {"type" : "string", "analyzer": "keyword" } } } } ' {"ok":true,"acknowledged":true}% mardi 17 décembre 13
  31. 31. # test on the field analysis curl -XGET 'localhost:9200/workshop/_analyze? pretty=true&field=site.tags' -d 'Open Source' { "tokens" : [ { "token" : "Open Source", "start_offset" : 0, "end_offset" : 11, "type" : "word", "position" : 1 } ] } # congrats ! mardi 17 décembre 13
  32. 32. # lets push data again curl -XPUT http://localhost:9200/workshop/site/1 -d ' { "url": "http://www.elasticsearch.org", "title": "Open Source Distributed Real Time Search & Analytics", "description": "Elasticsearch is a powerful open source search and analytics engine that makes data easy to explore.", "tags": ["Open Source", "elasticsearch", "Distributed"] }' curl -XPUT http://localhost:9200/workshop/site/2 -d ' { "url": "http://www.mathieu-elie.net", "title": "Mathieu ELIE Freelance - Full Stack Data Engineer, Data Visualization", "description": "Freelance Consultant in Bordeaux, System &amp; Software Architect. Love dataviz, redis, elasticsearch, architecture scalability recipes and playing with data.", tags: ["elasticsearch", "Data Visualization"] }' curl -XPUT http://localhost:9200/workshop/site/3 -d ' { "url": "http://www.giroll.org", "title": "Collectif Giroll - Gironde Logiciels Libres", "description": "Giroll, collectif bas√é √à Bordeaux, r√éunis autour des Logiciels et des Cultures libres. Ateliers tous les mardis de 18h30 √ mardi 17 décembre 13
  33. 33. # faceting ok ??? curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  34. 34. "facets" : { "tags" : { "_type" : "terms", "missing" : 0, "total" : 5, "other" : 0, "terms" : [ { "term" : "elasticsearch", "count" : 2 }, { "term" : "Open Source", "count" : 1 }, { "term" : "Distributed", "count" : 1 }, { "term" : "Data Visualization", "count" : 1 } ] } } cool ! our facets contains whole tags ! great jobs !! mardi 17 décembre 13
  35. 35. if want only docs with "Open Source" tag we use filters http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/query-dsl-filters.html and term filter mardi 17 décembre 13
  36. 36. curl -XGET 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "query" : { "match_all" : { } }, "filter" : { "term" : { "tags" : "Open Source"} } }' • more efficient than full text search • cached / indexed • you can filter using facet items mardi 17 décembre 13
  37. 37. RTFM WAY • elasticsearch doc is great • but it is exhaustive • so at the beguining its a bit frustrating mardi 17 décembre 13
  38. 38. Think about json hierachy curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  39. 39. your hitting the search api http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/search-search.html curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  40. 40. your using the query dsl http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/query-dsl.html curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  41. 41. your using different types of queries http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/query-dsl-queries.html curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  42. 42. this query is a query_string type with a query parameter set to elasticsearch http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/query-dsl-query-string-query.html curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  43. 43. we also use faceting http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/search-facets.html curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  44. 44. we use a terms facet http://www.elasticsearch.org/guide/en/elasticsearch/ reference/current/search-facets-terms-facet.html curl -XPOST 'http://localhost:9200/workshop/site/_search? pretty=true' -d '{ "fields" : ["title", "tags"], "query" : { "query_string" : { "query" : "elasticsearch" } }, "facets" : { "tags" : { "terms" : {"field" : "tags"} } } }' mardi 17 décembre 13
  45. 45. RTFM WAY • common mistake: the code example are not showing always whole query • so you should replace the code in the doc in the whole dsl hierarchy • think about hierarchy and everything should be more clear mardi 17 décembre 13
  46. 46. the end for me... the begguining for you... mardi 17 décembre 13
  47. 47. questions and more • twitter @mathieuel • contact on my freelance website • http://www.mathieu-elie.net • thanks to giroll for hosting this workshop ! mardi 17 décembre 13
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