More Related Content Similar to Elasticsearch 應用基礎知識 Similar to Elasticsearch 應用基礎知識 (20) More from LearningTech (20) 2. Field datatypes
a simple type like string, date, long, double, boolean or ip.
a type which supports the hierarchical nature of JSON such as object or nested.
or a specialised type like geo_point, geo_shape, or completion.
4. get - 取得資料
http://localhost:9200/_index/_type/_id
http://localhost:9200/_index/_type/_id?pretty
6. post search & query_string
http://localhost:9200/_index/_type/_search
http://localhost:9200/_index/_type/_search
{
"query": {
"query_string": {
"query": "*"
}
}
}
=
8. query_string - query
string
“手機” 套 = “手機” OR 套
apple phone = apple OR phone
title: “手機” OR title:套 = title: (“手機“ 套) ! = (title: “手機” 套)
boolean
isPCT: true
date & range
dateName: [2012-01-01 TO 2012-12-31]
dateName: [2012-01-01 TO *]
dateName: {2011-12-31 TO *]
range: [ 1 TO 5 ]
9. query_string - query
object
inventorsRaw.name: Nicky
_missing_ & _exists_
_missing_: title
_exists_: title
11. query – size & from
size (default: 10)
The size parameter allows you to configure the maximum amount of hits to be
returned.
from (default: 0)
The from parameter defines the offset from the first result you want to fetch.
[query_phase_execution_exception]
Result window is too large, from + size must be less than or equal to: [10000]
See the scroll api for a more efficient way to request large data sets.
12. query – sort & _source
sort
Allows to add one or more sort on specific fields.
_source
Allows to control how the _source field is returned with every hit.
{
"query": "…",
"size": 5,
"from": 10,
"sort": [{ "pubDate": "desc" }],
"_source": ["pubDate"],
}
13. query - filter
{
"query": {
"query_string": { "query": "*" }
},
"filter": {
"script": {
"script": {
"lang": "groovy",
"file": "fileNamw",
"params": {
"params1": "date1",
"params2": "date2",
}
}
}
}
}
14. query - aggregations (aggs)
The aggregations framework helps provide
aggregated data based on a search query.
size: 回傳的筆數
default :10
size: 0 回傳全部結果
min_doc_count: 回傳的結果最小筆數
order: 排序
date_histogram: 依照日期
terms: 依照doc_dount 結果
{
"query": "…",
"aggs": {
"date_agg": {
"date_histogram": {
"field": “pubDate",
"interval": "day",
"format": "yyyy-MM-dd",
"order": { "_count": "desc" },
"min_doc_count": 1
} },
"kindCode_agg": {
"terms": {
"field": "kindCode",
"size": 20,
"shard_size": 20
} }
}
}
15. query - aggregations (aggs)
{
"aggregations": {
"kindCode_agg": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{ "key": "U", "doc_count": 75879 },
{ "key": "A", "doc_count": 73732 },
{ "key": "B", "doc_count": 44115 },
{ "key": "S", "doc_count": 38981 } ] },
"appDocs": {
"buckets": [
{ "key_as_string": "2016-01-06", "key": 1452038400000, "doc_count": 56079 },
{ "key_as_string": "2016-01-13", "key": 1452643200000, "doc_count": 54256 },
{ "key_as_string": "2016-01-20", "key": 1453248000000, "doc_count": 80021 },
{ "key_as_string": "2016-01-27", "key": 1453852800000, "doc_count": 42351 } ] }
}
}
16. _timestamp field
Mapping query result
{
"mappings": {
"my_type": {
"_timestamp": {
"enabled": true
}
}
}
}
{
"_index": "test2",
"_type": "type",
"_id": "2",
"_score": 1,
"_timestamp": 1454051014319,
"_source": {
"name": "Tony",
"day": "1990-03-21"
}
}
19. Keeping the search context alive
The scroll parameter (passed to the search request and to every scroll request)
tells Elasticsearch how long it should keep the search context alive.
Its value (e.g. 1m, see the section called “Time unitsedit”) does not need to be
long enough to process all data — it just needs to be long enough to process the
previous batch of results.
Each scroll request (with the scroll parameter) sets a new expiry time.
22. {
"_scroll_id": "c2Nhbjs1OzE5NjMzOkxXdWt2d2V2UVFHTVvdGFsX2hpdHM6MT……..",
"took": 487,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1041712,
"max_score": 0,
"hits": [ {…….}, {…….}, {…….}, {…….}, {…….}, {…….}, {…….}, {…….}]
}
}
get
25. Cheaper in Bulk
{ action: { metadata }}n
{ request body }n
{ action: { metadata }}n
{ request body }n
…..
26. action
delete
{ "delete": { "_index": "website", "_type": "blog", "_id": "123" }}n
create
{ "create": { "_index": "website", "_type": "blog", "_id": "123" }} n
{ "title": "My first blog post" } n
Index
{ "index": { "_index": "website", "_type": "blog" }} n
{ "title": "My second blog post" } n
update
{ "update": { "_index": "website", "_type": "blog", "_id": "123", "_retry_on_conflict" : 3} } n
{ "doc" : {"title" : "My updated blog post"} } n
27. status
'200': 'OK',
'201': 'Created',
{ "took": 4,
"errors": false,
"items": [
{ "delete": {
"_index": "website", "_type": "blog", "_id": "123", "_version": 2, "status": 200, "found": true }},
{ "create": {
"_index": "website", "_type": "blog", "_id": "123", "_version": 3, "status": 201 }},
{ "create": {
"_index": "website", "_type": "blog", "_id": "EiwfApScQiiy7TIKFxRCTw", "_version": 1, "status": 201 }},
{ "update": {
"_index": "website", "_type": "blog", "_id": "123", "_version": 4, "status": 200 }}
]
}
28. Error Example
{ "create": { "_index": "website", "_type": "blog", "_id": "123" }}
{ "title": "Cannot create - it already exists" }
{ "index": { "_index": "website", "_type": "blog", "_id": "123" }}
{ "title": "But we can update it" }
29. Error Example
{ "took": 3,
"errors": true,
"items": [
{ "create": {
"_index": "website",
"_type": "blog",
"_id": "123",
"status": 409,
"error": "DocumentAlreadyExistsException [[website][4] [blog][123]: document already exists]" }},
{ "index": {
"_index": "website",
"_type": "blog",
"_id": "123",
"_version": 5,
"status": 200 }}
]
}
Editor's Notes https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-timestamp-field.html https://www.elastic.co/guide/en/elasticsearch/guide/current/_search_options.html#search-type?q=sear http://stackoverflow.com/questions/25453872/why-does-this-elasticsearch-scan-and-scroll-keep-returning-the-same-scroll-id
