[DOCS] Expanding Graph API reference content here & removing it from x-pack-kibana.

Original commit: elastic/x-pack-elasticsearch@89bce85e55
This commit is contained in:
Deb Adair 2017-06-27 13:42:11 -07:00
parent 231634251f
commit 32a283c51d
5 changed files with 500 additions and 235 deletions

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[role="xpack"]
[[graph-api]]
== Graph APIs
The Graph "explore" API is accessible via the
`/_xpack/graph/_explore` endpoint.
See {kibana-ref}/graph-api-explore.html[Explore API].
//* <<graph-api-explore>>
//TO-DO: Create a formatted API reference topic for explore:
//include::graph/explore.asciidoc[]

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[role="xpack"]
[[graph-explore]]
=== Explore API
[[graph-explore-api]]
== Explore API
The graph explore API ...
The Graph explore API enables you to extract and summarize information about
the documents and terms in your Elasticsearch index.
==== Request
The easiest way to understand the behaviour of this API is to use the
Graph UI to explore connections. You can view the most recent request submitted
to the `_explore` endpoint from the *Last request* panel. For more information,
see {kibana-ref}/graph-getting-started.html[Getting Started with Graph].
For additional information about working with the explore API, see the Graph
{kibana-ref}/graph-troubleshooting.html[Troubleshooting] and
{kibana-ref}/graph-limitations.html[Limitations] topics.
[float]
=== Request
`POST <index>/_xpack/graph/_explore`
[float]
=== Description
==== Description
An initial request to the `_explore` API contains a seed query that identifies
the documents of interest and specifies the fields that define the vertices
and connections you want to include in the graph. Subsequent `_explore` requests
enable you to _spider out_ from one more vertices of interest. You can exclude
vertices that have already been returned.
After an initial search users typically want to review the results using a form
of graph visualization tool like the one in the Kibana Graph UI. Users will
frequently then select one or more vertices of interest and ask to load more
vertices that may be connected to their current selection. In graph-speak,
this operation is often called _spidering_ or _spidering out_.
In order to spider out it is typically necessary to define two things:
* The set of vertices from which you would like to spider
* The set of vertices you already have in your workspace which you want to
avoid seeing again in results
These two pieces of information when passed to the graph explore API will
ensure you are returned new vertices that can be attached to the existing
selection.
The `include`and `exclude` clauses provide the essential features that enable
clients to progressively build up a picture of related information in their
workspace. The `include` clause is used to define the set of start points from
which users wish to spider. Include clauses can also be used to limit the end
points users wish to reach, thereby "filling in" some of the missing links
between existing vertices in their client-side workspace. The `exclude` clause
can be used to avoid the Graph API returning vertices already visible in a
client's workspace or perhaps could list undesirable vertices that the client
has blacklisted from their workspace and never wants to see returned.
//==== Path Parameters
//==== Query Parameters
==== Request Body
connections::
TBD. A list of fields is provided.
query:::
TBD. Optionally, a "guiding query" can be used to guide the API as it
explores connected terms.
vertices:::
TBD.
NOTE: Further "connections" can be nested inside the "connections" object to
continue exploring out the relationships in the data. Each level of nesting is
commonly referred to as a "hop" and proximity in a graph is often thought of in
terms of "hop depth".
controls::
TBD.
use_significance:::
TBD. The `use_significance` flag defaults to true and is used to filter
associated terms to only those that are significantly associated with our
query. The algorithm used to calculate significance are explained in the
documentation for the
{ref}/search-aggregations-bucket-significantterms-aggregation.html[significant_terms aggregation].
sample_size:::
TBD. Each "hop" considers a sample of the best-matching documents on each
shard (default is 100 documents). Using samples has the dual benefit of
keeping exploration focused on meaningfully-connected terms and improving
the speed of execution. Very small values (less than 50) may not provide
sufficient weight-of-evidence to identify significant connections between
terms while very large sample sizes may dilute the quality and be slow.
timeout:::
TBD. A `timeout` setting (expressed here in milliseconds) after which
exploration will be halted and results gathered so far are returned. This is
a best-effort approach to termination so may overrun if, for example, a long
pause is encountered while FieldData is loaded for a field.
sample_diversity:::
TBD. To avoid the top-matching documents sample being dominated by a single
source of results sometimes it can prove necessary to request diversity in
the sample. This is achieved by selecting a single-value field and a maximum
number of documents per value in that field. In this example we are
requiring that there are no more than 500 click documents from any one
department in the store. This might help us consider products from the
electronics, book and video departments whereas without this diversification
our results may be entirely dominated by the electronics department.
[float]
=== Request Body
query::
TBD. A query is used to "seed" the exploration. Any of the usual {es} query
syntax can be used here to identify the documents of interest.
A seed query that identifies the documents of interest. Can be any valid
Elasticsearch query. For example:
+
[source,js]
--------------------------------------------------
"query": {
"bool": {
"must": {
"match": {
"query.raw": "midi"
}
},
"filter": [
{
"range": {
"query_time": {
"gte": "2015-10-01 00:00:00"
}
}
}
]
}
}
--------------------------------------------------
vertices::
TBD. A list of fields is provided.
exclude:::
TBD. The `exclude` clause avoids returning specific terms.
field::: TBD
include:::
TBD. Lists the start points from which we want to spider using an `include`
array of the terms of interest. Note that if you have an `include` clause,
there is no need to define a seed query - we are implicitly querying for
documents that contain any of the terms listed in our include clauses.
Instead of passing plain strings in this array it is also possible to pass
objects with `term` and `boost` values to boost matches on certain terms
over others.
size:::
TBD. We can control the maximum number of vertex terms returned for each
field using the `size` property. (Default is 5).
min_doc_count:::
TBD. This property acts as a certainty threshold - just how many documents
have to contain a pair of terms before we consider this to be a useful
connection? (Default is 3).
shard_min_doc_count:::
TBD. This is an advanced setting - just how many documents on a shard have
to contain a pair of terms before we return this for global consideration?
(Default is 2).
Specifies or more fields that contain the terms you want to include in the
graph as vertices. For example:
+
[source,js]
--------------------------------------------------
"vertices": [
{
"field": "product"
}
]
--------------------------------------------------
//==== Authorization
field::: Identifies a field in the documents of interest.
include::: Identifies the terms of interest that form the starting points
from which you want to spider out. You do not have to specify a seed query
if you specify an include clause. The include clause implicitly querys for
documents that contain any of the listed terms listed.
In addition to specifying a simple array of strings, you can also pass
objects with `term` and `boost` values to boost matches on particular terms.
exclude:::
The `exclude` clause prevents the specified terms from being included in
the results.
size:::
Specifies the maximum number of vertex terms returned for each
field. Defaults to 5.
min_doc_count:::
Specifies how many documents must contain a pair of terms before it is
considered to be a useful connection. This setting acts as a certainty
threshold. Defaults to 3.
shard_min_doc_count:::
This advanced setting controls how many documents on a particular shard have
to contain a pair of terms before the connection is returned for global
consideration. Defaults to 2.
////
==== Examples
connections::
Specifies or more fields from which you want to extract terms that are
associated with the specified vertices. For example:
+
[source,js]
--------------------------------------------------
"connections": { <3>
"vertices": [
{
"field": "query.raw"
}
]
}
--------------------------------------------------
+
NOTE: Connections can be nested inside the `connections` object to
explore additional relationships in the data. Each level of nesting is
considered a _hop_, and proximity within the graph is often described in
terms of _hop depth_.
TO-DO: Add link to example in Kibana Guide
query:::
An optional _guiding query_ that constrains the Graph API as it
explores connected terms. For example, you might want to direct the Graph
API to ignore older data by specifying a query that identifies recent
documents.
vertices:::
Contains the fields you are interested in. For example:
+
[source,js]
--------------------------------------------------
"vertices": [
{
"field": "query.raw",
"size": 5,
"min_doc_count": 10,
"shard_min_doc_count": 3
}
]
--------------------------------------------------
////
controls:: Direct the Graph API how to build the graph.
use_significance:::
The `use_significance` flag filters associated terms so only those that are
significantly associated with your query are included. For information about
the algorithm used to calculate significance, see the
{ref}/search-aggregations-bucket-significantterms-aggregation.html[significant_terms
aggregation]. Defaults to `true`.
sample_size:::
Each _hop_ considers a sample of the best-matching documents on each
shard. Using samples improves the speed of execution and keeps
exploration focused on meaningfully-connected terms. Very small values
(less than 50) might not provide sufficient weight-of-evidence to identify
significant connections between terms. Very large sample sizes can dilute
the quality of the results and increase execution times.
Defaults to 100 documents.
timeout:::
The length of time in milliseconds after which exploration will be halted
and the results gathered so far are returned. This timeout is honored on
a best-effort basis. Execution might overrun this timeout if, for example,
a long pause is encountered while FieldData is loaded for a field.
sample_diversity:::
To avoid the top-matching documents sample being dominated by a single
source of results, it is sometimes necessary to request diversity in
the sample. You can do this by selecting a single-value field and setting
a maximum number of documents per value for that field. For example:
+
[source,js]
--------------------------------------------------
"sample_diversity": {
"field": "category.raw",
"max_docs_per_value": 500
}
--------------------------------------------------
// [float]
// === Authorization
[float]
=== Examples
[float]
[[basic-search]]
==== Basic exploration
An initial search typically begins with a query to identify strongly related terms.
[source,js]
--------------------------------------------------
POST clicklogs/_xpack/graph/_explore
{
"query": { <1>
"match": {
"query.raw": "midi"
}
},
"vertices": [ <2>
{
"field": "product"
}
],
"connections": { <3>
"vertices": [
{
"field": "query.raw"
}
]
}
}
--------------------------------------------------
// CONSOLE
<1> Seed the exploration with a query. This example is searching
clicklogs for people who searched for the term "midi".
<2> Identify the vertices to include in the graph. This example is looking for
product codes that are significantly associated with searches for "midi".
<3> Find the connections. This example is looking for other search
terms that led people to click on the products that are associated with
searches for "midi".
The response from the explore API looks like this:
[source,js]
--------------------------------------------------
{
"took": 0,
"timed_out": false,
"failures": [],
"vertices": [ <1>
{
"field": "query.raw",
"term": "midi cable",
"weight": 0.08745858139552132,
"depth": 1
},
{
"field": "product",
"term": "8567446",
"weight": 0.13247784285434397,
"depth": 0
},
{
"field": "product",
"term": "1112375",
"weight": 0.018600718471158982,
"depth": 0
},
{
"field": "query.raw",
"term": "midi keyboard",
"weight": 0.04802242866755111,
"depth": 1
}
],
"connections": [ <2>
{
"source": 0,
"target": 1,
"weight": 0.04802242866755111,
"doc_count": 13
},
{
"source": 2,
"target": 3,
"weight": 0.08120623870976627,
"doc_count": 23
}
]
}
--------------------------------------------------
<1> An array of all of the vertices that were discovered. A vertex is an indexed
term, so the field and term value are provided. The `weight` attribute specifies
a significance score. The `depth` attribute specifies the hop-level at which
the term was first encountered.
<2> The connections between the vertices in the array. The `source` and `target`
properties are indexed into the vertices array and indicate which vertex term led
to the other as part of exploration. The `doc_count` value indicates how many
documents in the sample set contain this pairing of terms (this is
not a global count for all documents in the index).
[float]
[[optional-controls]]
==== Optional controls
The default settings are configured to remove noisy data and
get the "big picture" from your data. This example shows how to specify
additional parameters to influence how the graph is built.
For tips on tuning the settings for more detailed forensic evaluation where
every document could be of interest, see the
{kibana-ref}/troubleshooting.html[Troubleshooting] guide.
[source,js]
--------------------------------------------------
POST clicklogs/_xpack/graph/_explore
{
"query": {
"match": {
"query.raw": "midi"
}
},
"controls": {
"use_significance": false,<1>
"sample_size": 2000,<2>
"timeout": 2000,<3>
"sample_diversity": {<4>
"field": "category.raw",
"max_docs_per_value": 500
}
},
"vertices": [
{
"field": "product",
"size": 5,<5>
"min_doc_count": 10,<6>
"shard_min_doc_count": 3<7>
}
],
"connections": {
"query": {<8>
"bool": {
"filter": [
{
"range": {
"query_time": {
"gte": "2015-10-01 00:00:00"
}
}
}
]
}
},
"vertices": [
{
"field": "query.raw",
"size": 5,
"min_doc_count": 10,
"shard_min_doc_count": 3
}
]
}
}
--------------------------------------------------
// CONSOLE
<1> Disable `use_significance` to include all associated terms, not just the
ones that are significantly associated with the query.
<2> Increase the sample size to consider a larger set of documents on
each shard.
<3> Limit how long a graph request runs before returning results.
<4> Ensure diversity in the sample by setting a limit on the number of documents
per value in a particular single-value field, such as a category field.
<5> Control the maximum number of vertex terms returned for each field.
<6> Set a certainty threshold that specifies how many documents have to contain
a pair of terms before we consider it to be a useful connection.
<7> Specify how many documents on a shard have to contain a pair of terms before
the connection is returned for global consideration.
<8> Restrict which document are considered as you explore connected terms.
[float]
[[spider-search]]
==== Spidering operations
After an initial search, you typically want to select vertices of interest and
see what additional vertices are connected. In graph-speak, this operation is
referred to as "spidering". By submitting a series of requests, you can
progressively build a graph of related information.
To spider out, you need to specify two things:
* The set of vertices for which you want to find additional connections
* The set of vertices you already know about that you want to exclude from the
results of the spidering operation.
You specify this information using `include`and `exclude` clauses. For example,
the following request starts with the product `1854873` and spiders
out to find additional search terms associated with that product. The terms
"midi", "midi keyboard", and "synth" are excluded from the results.
[source,js]
--------------------------------------------------
POST clicklogs/_xpack/graph/_explore
{
"vertices": [
{
"field": "product",
"include": [ "1854873" ] <1>
}
],
"connections": {
"vertices": [
{
"field": "query.raw",
"exclude": [ <2>
"midi keyboard",
"midi",
"synth"
]
}
]
}
}
--------------------------------------------------
// CONSOLE
<1> The vertices you want to start from are specified
as an array of terms in an `include` clause.
<2> The `exclude` clause prevents terms you already know about from being
included in the results.

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[partintro]
--
{xpack} exposes a wide range of REST APIs to manage and monitor its features.
{xpack} exposes REST APIs that are used by the UI components and can be called
directly to configure and access {xpack} features.
* <<info-api, Info API>>
//* <<security-api, Security APIs>>
* <<watcher-api, Watcher APIs>>
* <<graph-api, Graph APIs>>
* Graph <<graph-explore-api, Explore API>>
* <<ml-apis, Machine Learning APIs>>
* <<ml-api-definitions, Definitions>>
* {xpack-ref}/security-api.html[Security APIs]
* <<watcher-api, Watcher APIs>>
--
[role="xpack"]
[[info-api]]
== Info API
The info API provides general information on the installed {xpack}. This
information includes:
* Build Information - including the build number and timestamp.
* License Information - basic information about the currently installed license.
* Features Information - The features that are currently enabled and available
under the current license.
The following example queries the info API:
[source,js]
------------------------------------------------------------
GET /_xpack
------------------------------------------------------------
// CONSOLE
Example response:
[source,js]
------------------------------------------------------------
{
"build" : {
"hash" : "2798b1a3ce779b3611bb53a0082d4d741e4d3168",
"date" : "2015-04-07T13:34:42Z"
},
"license" : {
"uid" : "893361dc-9749-4997-93cb-802e3dofh7aa",
"type" : "trial",
"mode" : "trial",
"status" : "active",
"expiry_date_in_millis" : 1914278399999
},
"features" : {
"graph" : {
"description" : "Graph Data Exploration for the Elastic Stack",
"available" : true,
"enabled" : true
},
"logstash" : {
"description" : "Logstash management component for X-Pack",
"available" : true,
"enabled" : true
},
"ml" : {
"description" : "Machine Learning for the Elastic Stack",
"available" : true,
"enabled" : true,
"native_code_info" : {
"version" : "6.0.0-alpha1-SNAPSHOT",
"build_hash" : "d081461967d61a"
}
},
"monitoring" : {
"description" : "Monitoring for the Elastic Stack",
"available" : true,
"enabled" : true
},
"security" : {
"description" : "Security for the Elastic Stack",
"available" : true,
"enabled" : true
},
"watcher" : {
"description" : "Alerting, Notification and Automation for the Elastic Stack",
"available" : true,
"enabled" : true
}
},
"tagline" : "You know, for X"
}
------------------------------------------------------------
// TESTRESPONSE[s/"hash" : "2798b1a3ce779b3611bb53a0082d4d741e4d3168",/"hash" : "$body.build.hash",/]
// TESTRESPONSE[s/"date" : "2015-04-07T13:34:42Z"/"date" : "$body.build.date"/]
// TESTRESPONSE[s/"uid" : "893361dc-9749-4997-93cb-802e3dofh7aa",/"uid": "$body.license.uid",/]
// TESTRESPONSE[s/"expiry_date_in_millis" : 1914278399999/"expiry_date_in_millis" : "$body.license.expiry_date_in_millis"/]
// TESTRESPONSE[s/"version" : "6.0.0-alpha1-SNAPSHOT",/"version": "$body.features.ml.native_code_info.version",/]
// TESTRESPONSE[s/"build_hash" : "d081461967d61a"/"build_hash": "$body.features.ml.native_code_info.build_hash"/]
// So much s/// but at least we test that the layout is close to matching....
You can also control what information is returned using the `categories` and
`human` parameters.
The following example only returns the build and features information:
[source,js]
------------------------------------------------------------
GET /_xpack?categories=build,features
------------------------------------------------------------
// CONSOLE
The following example removes the descriptions from the response:
[source,js]
------------------------------------------------------------
GET /_xpack?human=false
------------------------------------------------------------
// CONSOLE
//include::security.asciidoc[]
include::watcher.asciidoc[]
include::graph.asciidoc[]
include::info.asciidoc[]
include::graph/explore.asciidoc[]
include::ml-api.asciidoc[]
// include::security.asciidoc[]
include::watcher.asciidoc[]
include::defs.asciidoc[]

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[role="xpack"]
[[info-api]]
== Info API
The info API provides general information on the installed {xpack}. This
information includes:
* Build Information - including the build number and timestamp.
* License Information - basic information about the currently installed license.
* Features Information - The features that are currently enabled and available
under the current license.
The following example queries the info API:
[source,js]
------------------------------------------------------------
GET /_xpack
------------------------------------------------------------
// CONSOLE
Example response:
[source,js]
------------------------------------------------------------
{
"build" : {
"hash" : "2798b1a3ce779b3611bb53a0082d4d741e4d3168",
"date" : "2015-04-07T13:34:42Z"
},
"license" : {
"uid" : "893361dc-9749-4997-93cb-802e3dofh7aa",
"type" : "trial",
"mode" : "trial",
"status" : "active",
"expiry_date_in_millis" : 1914278399999
},
"features" : {
"graph" : {
"description" : "Graph Data Exploration for the Elastic Stack",
"available" : true,
"enabled" : true
},
"logstash" : {
"description" : "Logstash management component for X-Pack",
"available" : true,
"enabled" : true
},
"ml" : {
"description" : "Machine Learning for the Elastic Stack",
"available" : true,
"enabled" : true,
"native_code_info" : {
"version" : "6.0.0-alpha1-SNAPSHOT",
"build_hash" : "d081461967d61a"
}
},
"monitoring" : {
"description" : "Monitoring for the Elastic Stack",
"available" : true,
"enabled" : true
},
"security" : {
"description" : "Security for the Elastic Stack",
"available" : true,
"enabled" : true
},
"watcher" : {
"description" : "Alerting, Notification and Automation for the Elastic Stack",
"available" : true,
"enabled" : true
}
},
"tagline" : "You know, for X"
}
------------------------------------------------------------
// TESTRESPONSE[s/"hash" : "2798b1a3ce779b3611bb53a0082d4d741e4d3168",/"hash" : "$body.build.hash",/]
// TESTRESPONSE[s/"date" : "2015-04-07T13:34:42Z"/"date" : "$body.build.date"/]
// TESTRESPONSE[s/"uid" : "893361dc-9749-4997-93cb-802e3dofh7aa",/"uid": "$body.license.uid",/]
// TESTRESPONSE[s/"expiry_date_in_millis" : 1914278399999/"expiry_date_in_millis" : "$body.license.expiry_date_in_millis"/]
// TESTRESPONSE[s/"version" : "6.0.0-alpha1-SNAPSHOT",/"version": "$body.features.ml.native_code_info.version",/]
// TESTRESPONSE[s/"build_hash" : "d081461967d61a"/"build_hash": "$body.features.ml.native_code_info.build_hash"/]
// So much s/// but at least we test that the layout is close to matching....
You can also control what information is returned using the `categories` and
`human` parameters.
The following example only returns the build and features information:
[source,js]
------------------------------------------------------------
GET /_xpack?categories=build,features
------------------------------------------------------------
// CONSOLE
The following example removes the descriptions from the response:
[source,js]
------------------------------------------------------------
GET /_xpack?human=false
------------------------------------------------------------
// CONSOLE

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@ -2,7 +2,9 @@
[[ml-apis]]
== Machine Learning APIs
You can use APIs to perform the following {ml} activities:
You can use the following APIs to perform {ml} activities.
See <<ml-api-definitions, Definitions>> for the resource definitions used by the
machine learning APIs and in advanced job configuration options in Kibana.
[float]
[[ml-api-datafeed-endpoint]]