- Elasticsearch Guide: other versions:
- Getting Started
- Set up Elasticsearch
- Installing Elasticsearch
- Configuring Elasticsearch
- Important Elasticsearch configuration
- Important System Configuration
- Bootstrap Checks
- Heap size check
- File descriptor check
- Memory lock check
- Maximum number of threads check
- Max file size check
- Maximum size virtual memory check
- Maximum map count check
- Client JVM check
- Use serial collector check
- System call filter check
- OnError and OnOutOfMemoryError checks
- Early-access check
- G1GC check
- All permission check
- Starting Elasticsearch
- Stopping Elasticsearch
- Adding nodes to your cluster
- Installing X-Pack
- Set up X-Pack
- Configuring X-Pack Java Clients
- X-Pack Settings
- Bootstrap Checks for X-Pack
- Upgrade Elasticsearch
- API Conventions
- Document APIs
- Search APIs
- Aggregations
- Metrics Aggregations
- Avg Aggregation
- Weighted Avg Aggregation
- Cardinality Aggregation
- Extended Stats Aggregation
- Geo Bounds Aggregation
- Geo Centroid Aggregation
- Max Aggregation
- Min Aggregation
- Percentiles Aggregation
- Percentile Ranks Aggregation
- Scripted Metric Aggregation
- Stats Aggregation
- Sum Aggregation
- Top Hits Aggregation
- Value Count Aggregation
- Median Absolute Deviation Aggregation
- Bucket Aggregations
- Adjacency Matrix Aggregation
- Auto-interval Date Histogram Aggregation
- Children Aggregation
- Composite Aggregation
- Date Histogram Aggregation
- Date Range Aggregation
- Diversified Sampler Aggregation
- Filter Aggregation
- Filters Aggregation
- Geo Distance Aggregation
- GeoHash grid Aggregation
- Global Aggregation
- Histogram Aggregation
- IP Range Aggregation
- Missing Aggregation
- Nested Aggregation
- Parent Aggregation
- Range Aggregation
- Reverse nested Aggregation
- Sampler Aggregation
- Significant Terms Aggregation
- Significant Text Aggregation
- Terms Aggregation
- Pipeline Aggregations
- Avg Bucket Aggregation
- Derivative Aggregation
- Max Bucket Aggregation
- Min Bucket Aggregation
- Sum Bucket Aggregation
- Stats Bucket Aggregation
- Extended Stats Bucket Aggregation
- Percentiles Bucket Aggregation
- Moving Average Aggregation
- Moving Function Aggregation
- Cumulative Sum Aggregation
- Bucket Script Aggregation
- Bucket Selector Aggregation
- Bucket Sort Aggregation
- Serial Differencing Aggregation
- Matrix Aggregations
- Caching heavy aggregations
- Returning only aggregation results
- Aggregation Metadata
- Returning the type of the aggregation
- Metrics Aggregations
- Indices APIs
- Create Index
- Delete Index
- Get Index
- Indices Exists
- Open / Close Index API
- Shrink Index
- Split Index
- Rollover Index
- Put Mapping
- Get Mapping
- Get Field Mapping
- Types Exists
- Index Aliases
- Update Indices Settings
- Get Settings
- Analyze
- Index Templates
- Indices Stats
- Indices Segments
- Indices Recovery
- Indices Shard Stores
- Clear Cache
- Flush
- Refresh
- Force Merge
- cat APIs
- Cluster APIs
- Query DSL
- Mapping
- Analysis
- Anatomy of an analyzer
- Testing analyzers
- Analyzers
- Normalizers
- Tokenizers
- Standard Tokenizer
- Letter Tokenizer
- Lowercase Tokenizer
- Whitespace Tokenizer
- UAX URL Email Tokenizer
- Classic Tokenizer
- Thai Tokenizer
- NGram Tokenizer
- Edge NGram Tokenizer
- Keyword Tokenizer
- Pattern Tokenizer
- Char Group Tokenizer
- Simple Pattern Tokenizer
- Simple Pattern Split Tokenizer
- Path Hierarchy Tokenizer
- Path Hierarchy Tokenizer Examples
- Token Filters
- Standard Token Filter
- ASCII Folding Token Filter
- Flatten Graph Token Filter
- Length Token Filter
- Lowercase Token Filter
- Uppercase Token Filter
- NGram Token Filter
- Edge NGram Token Filter
- Porter Stem Token Filter
- Shingle Token Filter
- Stop Token Filter
- Word Delimiter Token Filter
- Word Delimiter Graph Token Filter
- Multiplexer Token Filter
- Conditional Token Filter
- Predicate Token Filter Script
- Stemmer Token Filter
- Stemmer Override Token Filter
- Keyword Marker Token Filter
- Keyword Repeat Token Filter
- KStem Token Filter
- Snowball Token Filter
- Phonetic Token Filter
- Synonym Token Filter
- Parsing synonym files
- Synonym Graph Token Filter
- Compound Word Token Filters
- Reverse Token Filter
- Elision Token Filter
- Truncate Token Filter
- Unique Token Filter
- Pattern Capture Token Filter
- Pattern Replace Token Filter
- Trim Token Filter
- Limit Token Count Token Filter
- Hunspell Token Filter
- Common Grams Token Filter
- Normalization Token Filter
- CJK Width Token Filter
- CJK Bigram Token Filter
- Delimited Payload Token Filter
- Keep Words Token Filter
- Keep Types Token Filter
- Exclude mode settings example
- Classic Token Filter
- Apostrophe Token Filter
- Decimal Digit Token Filter
- Fingerprint Token Filter
- MinHash Token Filter
- Remove Duplicates Token Filter
- Character Filters
- Modules
- Index Modules
- Ingest Node
- Pipeline Definition
- Ingest APIs
- Accessing Data in Pipelines
- Conditional Execution in Pipelines
- Handling Failures in Pipelines
- Processors
- Append Processor
- Bytes Processor
- Convert Processor
- Date Processor
- Date Index Name Processor
- Dissect Processor
- Dot Expander Processor
- Drop Processor
- Fail Processor
- Foreach Processor
- GeoIP Processor
- Grok Processor
- Gsub Processor
- Join Processor
- JSON Processor
- KV Processor
- Pipeline Processor
- Remove Processor
- Rename Processor
- Script Processor
- Set Processor
- Set Security User Processor
- Split Processor
- Sort Processor
- Trim Processor
- Uppercase Processor
- URL Decode Processor
- User Agent processor
- Managing the index lifecycle
- SQL Access
- Monitor a cluster
- Rolling up historical data
- Frozen indices
- Set up a cluster for high availability
- Secure a cluster
- Overview
- Configuring security
- Encrypting communications in Elasticsearch
- Encrypting communications in an Elasticsearch Docker Container
- Enabling cipher suites for stronger encryption
- Separating node-to-node and client traffic
- Configuring an Active Directory realm
- Configuring a file realm
- Configuring an LDAP realm
- Configuring a native realm
- Configuring a PKI realm
- Configuring a SAML realm
- Configuring a Kerberos realm
- FIPS 140-2
- Security settings
- Security files
- Auditing Settings
- How security works
- User authentication
- Built-in users
- Internal users
- Token-based authentication services
- Realms
- Realm chains
- Active Directory user authentication
- File-based user authentication
- LDAP user authentication
- Native user authentication
- PKI user authentication
- SAML authentication
- Kerberos authentication
- Integrating with other authentication systems
- Enabling anonymous access
- Controlling the user cache
- Configuring SAML single-sign-on on the Elastic Stack
- User authorization
- Auditing security events
- Encrypting communications
- Restricting connections with IP filtering
- Cross cluster search, tribe, clients, and integrations
- Tutorial: Getting started with security
- Tutorial: Encrypting communications
- Troubleshooting
- Can’t log in after upgrading to 6.7.2
- Some settings are not returned via the nodes settings API
- Authorization exceptions
- Users command fails due to extra arguments
- Users are frequently locked out of Active Directory
- Certificate verification fails for curl on Mac
- SSLHandshakeException causes connections to fail
- Common SSL/TLS exceptions
- Common Kerberos exceptions
- Common SAML issues
- Internal Server Error in Kibana
- Setup-passwords command fails due to connection failure
- Failures due to relocation of the configuration files
- Limitations
- Alerting on Cluster and Index Events
- Command line tools
- How To
- Testing
- Glossary of terms
- X-Pack APIs
- Info API
- Cross-cluster replication APIs
- Explore API
- Freeze index
- Index lifecycle management API
- Licensing APIs
- Migration APIs
- Machine learning APIs
- Add events to calendar
- Add jobs to calendar
- Close jobs
- Create calendar
- Create datafeeds
- Create filter
- Create jobs
- Delete calendar
- Delete datafeeds
- Delete events from calendar
- Delete filter
- Delete forecast
- Delete jobs
- Delete jobs from calendar
- Delete model snapshots
- Delete expired data
- Find file structure
- Flush jobs
- Forecast jobs
- Get calendars
- Get buckets
- Get overall buckets
- Get categories
- Get datafeeds
- Get datafeed statistics
- Get influencers
- Get jobs
- Get job statistics
- Get machine learning info
- Get model snapshots
- Get scheduled events
- Get filters
- Get records
- Open jobs
- Post data to jobs
- Preview datafeeds
- Revert model snapshots
- Set upgrade mode
- Start datafeeds
- Stop datafeeds
- Update datafeeds
- Update filter
- Update jobs
- Update model snapshots
- Rollup APIs
- Security APIs
- Authenticate
- Change passwords
- Clear cache
- Clear roles cache
- Create API keys
- Create or update application privileges
- Create or update role mappings
- Create or update roles
- Create or update users
- Delete application privileges
- Delete role mappings
- Delete roles
- Delete users
- Disable users
- Enable users
- Get API key information
- Get application privileges
- Get role mappings
- Get roles
- Get token
- Get users
- Has privileges
- Invalidate API key
- Invalidate token
- SSL certificate
- Unfreeze index
- Watcher APIs
- Definitions
- Release Highlights
- Breaking changes
- Release Notes
- Elasticsearch version 6.7.2
- Elasticsearch version 6.7.1
- Elasticsearch version 6.7.0
- Elasticsearch version 6.6.2
- Elasticsearch version 6.6.1
- Elasticsearch version 6.6.0
- Elasticsearch version 6.5.4
- Elasticsearch version 6.5.3
- Elasticsearch version 6.5.2
- Elasticsearch version 6.5.1
- Elasticsearch version 6.5.0
- Elasticsearch version 6.4.3
- Elasticsearch version 6.4.2
- Elasticsearch version 6.4.1
- Elasticsearch version 6.4.0
- Elasticsearch version 6.3.2
- Elasticsearch version 6.3.1
- Elasticsearch version 6.3.0
- Elasticsearch version 6.2.4
- Elasticsearch version 6.2.3
- Elasticsearch version 6.2.2
- Elasticsearch version 6.2.1
- Elasticsearch version 6.2.0
- Elasticsearch version 6.1.4
- Elasticsearch version 6.1.3
- Elasticsearch version 6.1.2
- Elasticsearch version 6.1.1
- Elasticsearch version 6.1.0
- Elasticsearch version 6.0.1
- Elasticsearch version 6.0.0
- Elasticsearch version 6.0.0-rc2
- Elasticsearch version 6.0.0-rc1
- Elasticsearch version 6.0.0-beta2
- Elasticsearch version 6.0.0-beta1
- Elasticsearch version 6.0.0-alpha2
- Elasticsearch version 6.0.0-alpha1
- Elasticsearch version 6.0.0-alpha1 (Changes previously released in 5.x)
Task Management API
editTask Management API
editThe Task Management API is new and should still be considered a beta feature. The API may change in ways that are not backwards compatible
Current Tasks Information
editThe task management API allows to retrieve information about the tasks currently executing on one or more nodes in the cluster.
Retrieves all tasks currently running on all nodes in the cluster. |
|
Retrieves all tasks running on nodes |
|
Retrieves all cluster-related tasks running on nodes |
The result will look similar to the following:
{ "nodes" : { "oTUltX4IQMOUUVeiohTt8A" : { "name" : "H5dfFeA", "transport_address" : "127.0.0.1:9300", "host" : "127.0.0.1", "ip" : "127.0.0.1:9300", "tasks" : { "oTUltX4IQMOUUVeiohTt8A:124" : { "node" : "oTUltX4IQMOUUVeiohTt8A", "id" : 124, "type" : "direct", "action" : "cluster:monitor/tasks/lists[n]", "start_time_in_millis" : 1458585884904, "running_time_in_nanos" : 47402, "cancellable" : false, "parent_task_id" : "oTUltX4IQMOUUVeiohTt8A:123" }, "oTUltX4IQMOUUVeiohTt8A:123" : { "node" : "oTUltX4IQMOUUVeiohTt8A", "id" : 123, "type" : "transport", "action" : "cluster:monitor/tasks/lists", "start_time_in_millis" : 1458585884904, "running_time_in_nanos" : 236042, "cancellable" : false } } } } }
It is also possible to retrieve information for a particular task. The following
example retrieves information about task oTUltX4IQMOUUVeiohTt8A:124
:
GET _tasks/oTUltX4IQMOUUVeiohTt8A:124
If the task isn’t found, the API returns a 404.
To retrieve all children of a particular task:
GET _tasks?parent_task_id=oTUltX4IQMOUUVeiohTt8A:123
If the parent isn’t found, the API does not return a 404.
You can also use the detailed
request parameter to get more information about
the running tasks. This is useful for telling one task from another but is more
costly to execute. For example, fetching all searches using the detailed
request parameter:
GET _tasks?actions=*search&detailed
The results might look like:
{ "nodes" : { "oTUltX4IQMOUUVeiohTt8A" : { "name" : "H5dfFeA", "transport_address" : "127.0.0.1:9300", "host" : "127.0.0.1", "ip" : "127.0.0.1:9300", "tasks" : { "oTUltX4IQMOUUVeiohTt8A:464" : { "node" : "oTUltX4IQMOUUVeiohTt8A", "id" : 464, "type" : "transport", "action" : "indices:data/read/search", "description" : "indices[test], types[test], search_type[QUERY_THEN_FETCH], source[{\"query\":...}]", "start_time_in_millis" : 1483478610008, "running_time_in_nanos" : 13991383, "cancellable" : true } } } } }
The new description
field contains human readable text that identifies the
particular request that the task is performing such as identifying the search
request being performed by a search task like the example above. Other kinds of
task have different descriptions, like _reindex
which
has the search and the destination, or _bulk
which just has the
number of requests and the destination indices. Many requests will only have an
empty description because more detailed information about the request is not
easily available or particularly helpful in identifying the request.
_tasks
requests with detailed
may also return a status
. This is a report
of the internal status of the task. As such its format varies from task to task.
While we try to keep the status
for a particular task consistent from version
to version this isn’t always possible because we sometimes change the
implementation. In that case we might remove fields from the status
for a
particular request so any parsing you do of the status might break in minor
releases.
The task API can also be used to wait for completion of a particular task. The
following call will block for 10 seconds or until the task with id
oTUltX4IQMOUUVeiohTt8A:12345
is completed.
GET _tasks/oTUltX4IQMOUUVeiohTt8A:12345?wait_for_completion=true&timeout=10s
You can also wait for all tasks for certain action types to finish. This
command will wait for all reindex
tasks to finish:
GET _tasks?actions=*reindex&wait_for_completion=true&timeout=10s
Tasks can be also listed using _cat version of the list tasks command, which accepts the same arguments as the standard list tasks command.
GET _cat/tasks GET _cat/tasks?detailed
Task Cancellation
editIf a long-running task supports cancellation, it can be cancelled with the cancel
tasks API. The following example cancels task oTUltX4IQMOUUVeiohTt8A:12345
:
POST _tasks/oTUltX4IQMOUUVeiohTt8A:12345/_cancel
The task cancellation command supports the same task selection parameters as the list tasks command, so multiple tasks
can be cancelled at the same time. For example, the following command will cancel all reindex tasks running on the
nodes nodeId1
and nodeId2
.
POST _tasks/_cancel?nodes=nodeId1,nodeId2&actions=*reindex
Task Grouping
editThe task lists returned by task API commands can be grouped either by nodes (default) or by parent tasks using the group_by
parameter.
The following command will change the grouping to parent tasks:
GET _tasks?group_by=parents
The grouping can be disabled by specifying none
as a group_by
parameter:
GET _tasks?group_by=none
Identifying running tasks
editThe X-Opaque-Id
header, when provided on the HTTP request header, is going to be returned as a header in the response as well as
in the headers
field for in the task information. This allows to track certain calls, or associate certain tasks with
a the client that started them:
curl -i -H "X-Opaque-Id: 123456" "http://localhost:9200/_tasks?group_by=parents"
The result will look similar to the following:
HTTP/1.1 200 OK X-Opaque-Id: 123456 content-type: application/json; charset=UTF-8 content-length: 831 { "tasks" : { "u5lcZHqcQhu-rUoFaqDphA:45" : { "node" : "u5lcZHqcQhu-rUoFaqDphA", "id" : 45, "type" : "transport", "action" : "cluster:monitor/tasks/lists", "start_time_in_millis" : 1513823752749, "running_time_in_nanos" : 293139, "cancellable" : false, "headers" : { "X-Opaque-Id" : "123456" }, "children" : [ { "node" : "u5lcZHqcQhu-rUoFaqDphA", "id" : 46, "type" : "direct", "action" : "cluster:monitor/tasks/lists[n]", "start_time_in_millis" : 1513823752750, "running_time_in_nanos" : 92133, "cancellable" : false, "parent_task_id" : "u5lcZHqcQhu-rUoFaqDphA:45", "headers" : { "X-Opaque-Id" : "123456" } } ] } } }