问题
I have a small database in Elasticsearch and for testing purposes would like to pull all records back. I am attempting to use a URL of the form...
http://localhost:9200/foo/_search?pretty=true&q={'matchAll':{''}}
Can someone give me the URL you would use to accomplish this, please?
回答1:
I think lucene syntax is supported so:
http://localhost:9200/foo/_search?pretty=true&q=*:*
size defaults to 10, so you may also need &size=BIGNUMBER to get more than 10 items. (where BIGNUMBER equals a number you believe is bigger than your dataset)
BUT, elasticsearch documentation suggests for large result sets, using the scan search type.
EG:
curl -XGET 'localhost:9200/foo/_search?search_type=scan&scroll=10m&size=50' -d '
{
"query" : {
"match_all" : {}
}
}'
and then keep requesting as per the documentation link above suggests.
EDIT: scan Deprecated in 2.1.0.
scan does not provide any benefits over a regular scroll request sorted by _doc. link to elastic docs (spotted by @christophe-roussy)
回答2:
http://127.0.0.1:9200/foo/_search/?size=1000&pretty=1
^
Note the size param, which increases the hits displayed from the default (10) to 1000 per shard.
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-from-size.html
回答3:
elasticsearch(ES) supports both a GET or a POST request for getting the data from the ES cluster index.
When we do a GET:
http://localhost:9200/[your index name]/_search?size=[no of records you want]&q=*:*
When we do a POST:
http://localhost:9200/[your_index_name]/_search
{
"size": [your value] //default 10
"from": [your start index] //default 0
"query":
{
"match_all": {}
}
}
I would suggest to use a UI plugin with elasticsearch http://mobz.github.io/elasticsearch-head/ This will help you get a better feeling of the indices you create and also test your indices.
回答4:
Note: The answer relates to an older version of Elasticsearch
0.90. Versions released since then have an updated syntax. Please refer to other answers that may provide a more accurate answer to the latest answer that you are looking for.
The query below would return the NO_OF_RESULTS you would like to be returned..
curl -XGET 'localhost:9200/foo/_search?size=NO_OF_RESULTS' -d '
{
"query" : {
"match_all" : {}
}
}'
Now, the question here is that you want all the records to be returned. So naturally, before writing a query, you wont know the value of NO_OF_RESULTS.
How do we know how many records exist in your document? Simply type the query below
curl -XGET 'localhost:9200/foo/_search' -d '
This would give you a result that looks like the one below
{
hits" : {
"total" : 2357,
"hits" : [
{
..................
The result total tells you how many records are available in your document. So, that's a nice way to know the value of NO_OF RESULTS
curl -XGET 'localhost:9200/_search' -d '
Search all types in all indices
curl -XGET 'localhost:9200/foo/_search' -d '
Search all types in the foo index
curl -XGET 'localhost:9200/foo1,foo2/_search' -d '
Search all types in the foo1 and foo2 indices
curl -XGET 'localhost:9200/f*/_search
Search all types in any indices beginning with f
curl -XGET 'localhost:9200/_all/type1,type2/_search' -d '
Search types user and tweet in all indices
回答5:
This is the best solution I found using python client
# Initialize the scroll
page = es.search(
index = 'yourIndex',
doc_type = 'yourType',
scroll = '2m',
search_type = 'scan',
size = 1000,
body = {
# Your query's body
})
sid = page['_scroll_id']
scroll_size = page['hits']['total']
# Start scrolling
while (scroll_size > 0):
print "Scrolling..."
page = es.scroll(scroll_id = sid, scroll = '2m')
# Update the scroll ID
sid = page['_scroll_id']
# Get the number of results that we returned in the last scroll
scroll_size = len(page['hits']['hits'])
print "scroll size: " + str(scroll_size)
# Do something with the obtained page
https://gist.github.com/drorata/146ce50807d16fd4a6aa
Using java client
import static org.elasticsearch.index.query.QueryBuilders.*;
QueryBuilder qb = termQuery("multi", "test");
SearchResponse scrollResp = client.prepareSearch(test)
.addSort(FieldSortBuilder.DOC_FIELD_NAME, SortOrder.ASC)
.setScroll(new TimeValue(60000))
.setQuery(qb)
.setSize(100).execute().actionGet(); //100 hits per shard will be returned for each scroll
//Scroll until no hits are returned
do {
for (SearchHit hit : scrollResp.getHits().getHits()) {
//Handle the hit...
}
scrollResp = client.prepareSearchScroll(scrollResp.getScrollId()).setScroll(new TimeValue(60000)).execute().actionGet();
} while(scrollResp.getHits().getHits().length != 0); // Zero hits mark the end of the scroll and the while loop.
https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-search-scrolling.html
回答6:
use server:9200/_stats also to get statistics about all your aliases.. like size and number of elements per alias, that's very useful and provides helpful information
回答7:
Elasticsearch will get significant slower if you just add some big number as size, one method to use to get all documents is using scan and scroll ids.
https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-scroll.html
In Elasticsearch v7.2, you do it like this:
POST /foo/_search?scroll=1m
{
"size": 100,
"query": {
"match_all": {}
}
}
The results from this would contain a _scroll_id which you have to query to get the next 100 chunk.
POST /_search/scroll
{
"scroll" : "1m",
"scroll_id" : "<YOUR SCROLL ID>"
}
回答8:
If you want to pull many thousands of records then... a few people gave the right answer of using 'scroll' (Note: Some people also suggested using "search_type=scan". This was deprecated, and in v5.0 removed. You don't need it)
Start with a 'search' query, but specifying a 'scroll' parameter (here I'm using a 1 minute timeout):
curl -XGET 'http://ip1:9200/myindex/_search?scroll=1m' -d '
{
"query": {
"match_all" : {}
}
}
'
That includes your first 'batch' of hits. But we are not done here. The output of the above curl command would be something like this:
{"_scroll_id":"c2Nhbjs1OzUyNjE6NU4tU3BrWi1UWkNIWVNBZW43bXV3Zzs1Mzc3OkhUQ0g3VGllU2FhemJVNlM5d2t0alE7NTI2Mjo1Ti1TcGtaLVRaQ0hZU0FlbjdtdXdnOzUzNzg6SFRDSDdUaWVTYWF6YlU2Uzl3a3RqUTs1MjYzOjVOLVNwa1otVFpDSFlTQWVuN211d2c7MTt0b3RhbF9oaXRzOjIyNjAxMzU3Ow==","took":109,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":22601357,"max_score":0.0,"hits":[]}}
It's important to have _scroll_id handy as next you should run the following command:
curl -XGET 'localhost:9200/_search/scroll' -d'
{
"scroll" : "1m",
"scroll_id" : "c2Nhbjs2OzM0NDg1ODpzRlBLc0FXNlNyNm5JWUc1"
}
'
However, passing the scroll_id around is not something designed to be done manually. Your best bet is to write code to do it. e.g. in java:
private TransportClient client = null;
private Settings settings = ImmutableSettings.settingsBuilder()
.put(CLUSTER_NAME,"cluster-test").build();
private SearchResponse scrollResp = null;
this.client = new TransportClient(settings);
this.client.addTransportAddress(new InetSocketTransportAddress("ip", port));
QueryBuilder queryBuilder = QueryBuilders.matchAllQuery();
scrollResp = client.prepareSearch(index).setSearchType(SearchType.SCAN)
.setScroll(new TimeValue(60000))
.setQuery(queryBuilder)
.setSize(100).execute().actionGet();
scrollResp = client.prepareSearchScroll(scrollResp.getScrollId())
.setScroll(new TimeValue(timeVal))
.execute()
.actionGet();
Now LOOP on the last command use SearchResponse to extract the data.
回答9:
Simple! You can use size and from parameter!
http://localhost:9200/[your index name]/_search?size=1000&from=0
then you change the from gradually until you get all of the data.
回答10:
The best way to adjust the size is using size=number in front of the URL
Curl -XGET "http://localhost:9200/logstash-*/_search?size=50&pretty"
Note: maximum value which can be defined in this size is 10000. For any value above ten thousand it expects you to use scroll function which would minimise any chances of impacts to performance.
回答11:
You can use the _count API to get the value for the size parameter:
http://localhost:9200/foo/_count?q=<your query>
Returns {count:X, ...}. Extract value 'X' and then do the actual query:
http://localhost:9200/foo/_search?q=<your query>&size=X
回答12:
http://localhost:9200/foo/_search/?size=1000&pretty=1
you will need to specify size query parameter as the default is 10
回答13:
size param increases the hits displayed from from the default(10) to 500.
http://localhost:9200/[indexName]/_search?pretty=true&size=500&q=*:*
Change the from step by step to get all the data.
http://localhost:9200/[indexName]/_search?size=500&from=0
回答14:
For Elasticsearch 6.x
Request: GET /foo/_search?pretty=true
Response: In Hits-> total, give the count of the docs
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1001,
"max_score": 1,
"hits": [
{
回答15:
curl -X GET 'localhost:9200/foo/_search?q=*&pretty'
回答16:
By default Elasticsearch return 10 records so size should be provided explicitly.
Add size with request to get desire number of records.
http://{host}:9200/{index_name}/_search?pretty=true&size=(number of records)
Note : Max page size can not be more than index.max_result_window index setting which defaults to 10,000.
回答17:
From Kibana DevTools its:
GET my_index_name/_search
{
"query": {
"match_all": {}
}
}
回答18:
A simple solution using the python package elasticsearch-dsl:
from elasticsearch_dsl import Search
from elasticsearch_dsl import connections
connections.create_connection(hosts=['localhost'])
s = Search(index="foo")
response = s.scan()
count = 0
for hit in response:
# print(hit.to_dict()) # be careful, it will printout every hit in your index
count += 1
print(count)
See also https://elasticsearch-dsl.readthedocs.io/en/latest/api.html#elasticsearch_dsl.Search.scan .
回答19:
The maximum result which will return by elasticSearch is 10000 by providing the size
curl -XGET 'localhost:9200/index/type/_search?scroll=1m' -d '
{
"size":10000,
"query" : {
"match_all" : {}
}
}'
After that, you have to use Scroll API for getting the result and get the _scroll_id value and put this value in scroll_id
curl -XGET 'localhost:9200/_search/scroll' -d'
{
"scroll" : "1m",
"scroll_id" : ""
}'
回答20:
The official documentation provides the answer to this question! you can find it here.
{
"query": { "match_all": {} },
"size": 1
}
You simply replace size (1) with the number of results you want to see!
回答21:
If it's a small dataset (e.g. 1K records), you can simply specify size:
curl localhost:9200/foo_index/_search?size=1000
The match all query isn't needed, as it's implicit.
If you have a medium-sized dataset, like 1M records, you may not have enough memory to load it, so you need a scroll.
A scroll is like a cursor in a DB. In Elasticsearch, it remembers where you left off and keeps the same view of the index (i.e. prevents the searcher from going away with a refresh, prevents segments from merging).
API-wise, you have to add a scroll parameter to the first request:
curl 'localhost:9200/foo_index/_search?size=100&scroll=1m&pretty'
You get back the first page and a scroll ID:
{
"_scroll_id" : "DXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAADEWbmJlSmxjb2hSU0tMZk12aEx2c0EzUQ==",
"took" : 0,
...
Remember that both the scroll ID you get back and the timeout are valid for the next page. A common mistake here is to specify a very large timeout (value of scroll), that would cover for processing the whole dataset (e.g. 1M records) instead of one page (e.g. 100 records).
To get the next page, fill in the last scroll ID and a timeout that should last until fetching the following page:
curl -XPOST -H 'Content-Type: application/json' 'localhost:9200/_search/scroll' -d '{
"scroll": "1m",
"scroll_id": "DXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAADAWbmJlSmxjb2hSU0tMZk12aEx2c0EzUQ=="
}'
If you have a lot to export (e.g. 1B documents), you'll want to parallelise. This can be done via sliced scroll. Say you want to export on 10 threads. The first thread would issue a request like this:
curl -XPOST -H 'Content-Type: application/json' 'localhost:9200/test/_search?scroll=1m&size=100' -d '{
"slice": {
"id": 0,
"max": 10
}
}'
You get back the first page and a scroll ID, exactly like a normal scroll request. You'd consume it exactly like a regular scroll, except that you get 1/10th of the data.
Other threads would do the same, except that id would be 1, 2, 3...
回答22:
To return all records from all indices you can do:
curl -XGET http://35.195.120.21:9200/_all/_search?size=50&pretty
Output:
"took" : 866,
"timed_out" : false,
"_shards" : {
"total" : 25,
"successful" : 25,
"failed" : 0
},
"hits" : {
"total" : 512034694,
"max_score" : 1.0,
"hits" : [ {
"_index" : "grafana-dash",
"_type" : "dashboard",
"_id" : "test",
"_score" : 1.0,
...
回答23:
curl -XGET '{{IP/localhost}}:9200/{{Index name}}/{{type}}/_search?scroll=10m&pretty' -d '{
"query": {
"filtered": {
"query": {
"match_all": {}
}}'
回答24:
None except @Akira Sendoh has answered how to actually get ALL docs. But even that solution crashes my ES 6.3 service without logs. The only thing that worked for me using the low-level elasticsearch-py library was through scan helper that uses scroll() api:
from elasticsearch.helpers import scan
doc_generator = scan(
es_obj,
query={"query": {"match_all": {}}},
index="my-index",
)
# use the generator to iterate, dont try to make a list or you will get out of RAM
for doc in doc_generator:
# use it somehow
However, the cleaner way nowadays seems to be through elasticsearch-dsl library, that offers more abstract, cleaner calls, e.g: http://elasticsearch-dsl.readthedocs.io/en/latest/search_dsl.html#hits
回答25:
If still someone is looking for all the data to be retrieved from Elasticsearch like me for some usecases, here is what I did. Moreover, all the data means, all the indexes and all the documents types. I'm using Elasticsearch 6.3
curl -X GET "localhost:9200/_search?pretty=true" -H 'Content-Type: application/json' -d'
{
"query": {
"match_all": {}
}
}
'
Elasticsearch reference
回答26:
this is the query to accomplish what you want, (I am suggesting to use Kibana, as it helps to understand queries better)
GET my_index_name/my_type_name/_search
{
"query":{
"match_all":{}
},
size : 20,
from : 3
}
to get all records you have to use "match_all" query.
size is the no of records you want to fetch (kind of limit). by default, ES will only return 10 records
from is like skip, skip first 3 records.
If you want to fetch exactly all the records, just use the value from the "total" field from the result once you hit this query from Kibana and the use it with "size".
回答27:
Using Elasticsearch 7.5.1
http://${HOST}:9200/${INDEX}/_search?pretty=true&q=*:*&scroll=10m&size=5000
in case you can also specify the size of your array with &size=${number}
in case you don't know you index
http://${HOST}:9200/_cat/indices?v
回答28:
Using kibana console and my_index as the index to search the following can be contributed. Asking the index to only return 4 fields of the index, you can also add size to indicate how many documents that you want to be returned by the index. As of ES 7.6 you should use _source rather than filter it will respond faster.
GET /address/_search
{
"_source": ["streetaddress","city","state","postcode"],
"size": 100,
"query":{
"match_all":{ }
}
}
回答29:
You can use size=0 this will return you all the documents example
curl -XGET 'localhost:9200/index/type/_search' -d '
{
size:0,
"query" : {
"match_all" : {}
}
}'
来源：https://stackoverflow.com/questions/8829468/elasticsearch-query-to-return-all-records