690 lines
21 KiB
Plaintext
690 lines
21 KiB
Plaintext
[[api-conventions]]
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= API Conventions
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[partintro]
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--
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The *elasticsearch* REST APIs are exposed using <<modules-http,JSON over HTTP>>.
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The conventions listed in this chapter can be applied throughout the REST
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API, unless otherwise specified.
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* <<multi-index>>
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* <<date-math-index-names>>
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* <<common-options>>
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* <<url-access-control>>
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--
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[[multi-index]]
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== Multiple Indices
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Most APIs that refer to an `index` parameter support execution across multiple indices,
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using simple `test1,test2,test3` notation (or `_all` for all indices). It also
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support wildcards, for example: `test*` or `*test` or `te*t` or `*test*`, and the ability to "add" (`+`)
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and "remove" (`-`), for example: `+test*,-test3`.
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All multi indices API support the following url query string parameters:
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`ignore_unavailable`::
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Controls whether to ignore if any specified indices are unavailable, this
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includes indices that don't exist or closed indices. Either `true` or `false`
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can be specified.
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`allow_no_indices`::
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Controls whether to fail if a wildcard indices expressions results into no
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concrete indices. Either `true` or `false` can be specified. For example if
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the wildcard expression `foo*` is specified and no indices are available that
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start with `foo` then depending on this setting the request will fail. This
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setting is also applicable when `_all`, `*` or no index has been specified. This
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settings also applies for aliases, in case an alias points to a closed index.
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`expand_wildcards`::
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Controls to what kind of concrete indices wildcard indices expression expand
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to. If `open` is specified then the wildcard expression is expanded to only
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open indices and if `closed` is specified then the wildcard expression is
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expanded only to closed indices. Also both values (`open,closed`) can be
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specified to expand to all indices.
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If `none` is specified then wildcard expansion will be disabled and if `all`
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is specified, wildcard expressions will expand to all indices (this is equivalent
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to specifying `open,closed`).
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The defaults settings for the above parameters depend on the api being used.
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NOTE: Single index APIs such as the <<docs>> and the
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<<indices-aliases,single-index `alias` APIs>> do not support multiple indices.
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[[date-math-index-names]]
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== Date math support in index names
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Date math index name resolution enables you to search a range of time-series indices, rather
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than searching all of your time-series indices and filtering the results or maintaining aliases.
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Limiting the number of indices that are searched reduces the load on the cluster and improves
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execution performance. For example, if you are searching for errors in your
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daily logs, you can use a date math name template to restrict the search to the past
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two days.
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Almost all APIs that have an `index` parameter, support date math in the `index` parameter
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value.
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A date math index name takes the following form:
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[source,txt]
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----------------------------------------------------------------------
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<static_name{date_math_expr{date_format|time_zone}}>
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----------------------------------------------------------------------
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Where:
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[horizontal]
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`static_name`:: is the static text part of the name
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`date_math_expr`:: is a dynamic date math expression that computes the date dynamically
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`date_format`:: is the optional format in which the computed date should be rendered. Defaults to `YYYY.MM.dd`.
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`time_zone`:: is the optional time zone . Defaults to `utc`.
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You must enclose date math index name expressions within angle brackets, and
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all special characters should be URI encoded. For example:
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[source,js]
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----------------------------------------------------------------------
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# GET /<logstash-{now/d}>/_search
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GET /%3Clogstash-%7Bnow%2Fd%7D%3E/_search
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{
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"query" : {
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"match": {
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"test": "data"
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}
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}
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}
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----------------------------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT logstash-2016.09.20\n/]
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// TEST[s/now/2016.09.20||/]
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[NOTE]
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.Percent encoding of date math characters
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======================================================
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The special characters used for date rounding must be URI encoded as follows:
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[horizontal]
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`<`:: `%3C`
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`>`:: `%3E`
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`/`:: `%2F`
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`{`:: `%7B`
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`}`:: `%7D`
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`|`:: `%7C`
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`+`:: `%2B`
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`:`:: `%3A`
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======================================================
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The following example shows different forms of date math index names and the final index names
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they resolve to given the current time is 22rd March 2024 noon utc.
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[options="header"]
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|======
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| Expression |Resolves to
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| `<logstash-{now/d}>` | `logstash-2024.03.22`
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| `<logstash-{now/M}>` | `logstash-2024.03.01`
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| `<logstash-{now/M{YYYY.MM}}>` | `logstash-2024.03`
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| `<logstash-{now/M-1M{YYYY.MM}}>` | `logstash-2024.02`
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| `<logstash-{now/d{YYYY.MM.dd\|+12:00}}>` | `logstash-2024.03.23`
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|======
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To use the characters `{` and `}` in the static part of an index name template, escape them
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with a backslash `\`, for example:
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* `<elastic\\{ON\\}-{now/M}>` resolves to `elastic{ON}-2024.03.01`
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The following example shows a search request that searches the Logstash indices for the past
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three days, assuming the indices use the default Logstash index name format,
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`logstash-YYYY.MM.dd`.
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[source,js]
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----------------------------------------------------------------------
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# GET /<logstash-{now/d-2d}>,<logstash-{now/d-1d}>,<logstash-{now/d}>/_search
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GET /%3Clogstash-%7Bnow%2Fd-2d%7D%3E%2C%3Clogstash-%7Bnow%2Fd-1d%7D%3E%2C%3Clogstash-%7Bnow%2Fd%7D%3E/_search
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{
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"query" : {
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"match": {
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"test": "data"
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}
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}
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}
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----------------------------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT logstash-2016.09.20\nPUT logstash-2016.09.19\nPUT logstash-2016.09.18\n/]
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// TEST[s/now/2016.09.20||/]
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[[common-options]]
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== Common options
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The following options can be applied to all of the REST APIs.
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[float]
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=== Pretty Results
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When appending `?pretty=true` to any request made, the JSON returned
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will be pretty formatted (use it for debugging only!). Another option is
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to set `?format=yaml` which will cause the result to be returned in the
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(sometimes) more readable yaml format.
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[float]
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=== Human readable output
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Statistics are returned in a format suitable for humans
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(eg `"exists_time": "1h"` or `"size": "1kb"`) and for computers
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(eg `"exists_time_in_millis": 3600000` or `"size_in_bytes": 1024`).
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The human readable values can be turned off by adding `?human=false`
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to the query string. This makes sense when the stats results are
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being consumed by a monitoring tool, rather than intended for human
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consumption. The default for the `human` flag is
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`false`.
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[[date-math]]
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[float]
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=== Date Math
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Most parameters which accept a formatted date value -- such as `gt` and `lt`
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in <<query-dsl-range-query,range queries>> `range` queries, or `from` and `to`
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in <<search-aggregations-bucket-daterange-aggregation,`daterange`
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aggregations>> -- understand date maths.
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The expression starts with an anchor date, which can either be `now`, or a
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date string ending with `||`. This anchor date can optionally be followed by
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one or more maths expressions:
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* `+1h` - add one hour
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* `-1d` - subtract one day
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* `/d` - round down to the nearest day
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The supported time units differ than those supported by <<time-units, time units>> for durations.
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The supported units are:
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[horizontal]
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`y`:: years
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`M`:: months
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`w`:: weeks
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`d`:: days
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`h`:: hours
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`H`:: hours
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`m`:: minutes
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`s`:: seconds
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Some examples are:
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[horizontal]
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`now+1h`:: The current time plus one hour, with ms resolution.
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`now+1h+1m`:: The current time plus one hour plus one minute, with ms resolution.
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`now+1h/d`:: The current time plus one hour, rounded down to the nearest day.
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`2015-01-01||+1M/d`:: `2015-01-01` plus one month, rounded down to the nearest day.
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[float]
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[[common-options-response-filtering]]
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=== Response Filtering
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All REST APIs accept a `filter_path` parameter that can be used to reduce
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the response returned by elasticsearch. This parameter takes a comma
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separated list of filters expressed with the dot notation:
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[source,js]
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--------------------------------------------------
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GET /_search?q=elasticsearch&filter_path=took,hits.hits._id,hits.hits._score
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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Responds:
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[source,js]
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--------------------------------------------------
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{
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"took" : 3,
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"hits" : {
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"hits" : [
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{
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"_id" : "0",
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"_score" : 1.6375021
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}
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]
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"took" : 3/"took" : $body.took/]
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// TESTRESPONSE[s/1.6375021/$body.hits.hits.0._score/]
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It also supports the `*` wildcard character to match any field or part
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of a field's name:
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[source,sh]
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--------------------------------------------------
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GET /_cluster/state?filter_path=metadata.indices.*.stat*
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--------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT twitter\n/]
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Responds:
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[source,sh]
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--------------------------------------------------
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{
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"metadata" : {
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"indices" : {
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"twitter": {"state": "open"}
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE
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And the `**` wildcard can be used to include fields without knowing the
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exact path of the field. For example, we can return the Lucene version
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of every segment with this request:
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[source,js]
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--------------------------------------------------
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GET /_cluster/state?filter_path=routing_table.indices.**.state
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--------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT twitter\n/]
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Responds:
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[source,js]
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--------------------------------------------------
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{
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"routing_table": {
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"indices": {
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"twitter": {
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"shards": {
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"0": [{"state": "STARTED"}, {"state": "UNASSIGNED"}],
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"1": [{"state": "STARTED"}, {"state": "UNASSIGNED"}],
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"2": [{"state": "STARTED"}, {"state": "UNASSIGNED"}],
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"3": [{"state": "STARTED"}, {"state": "UNASSIGNED"}],
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"4": [{"state": "STARTED"}, {"state": "UNASSIGNED"}]
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}
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}
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE
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It is also possible to exclude one or more fields by prefixing the filter with the char `-`:
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[source,js]
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--------------------------------------------------
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GET /_count?filter_path=-_shards
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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Responds:
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[source,js]
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--------------------------------------------------
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{
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"count" : 5
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}
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--------------------------------------------------
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// TESTRESPONSE
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And for more control, both inclusive and exclusive filters can be combined in the same expression. In
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this case, the exclusive filters will be applied first and the result will be filtered again using the
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inclusive filters:
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[source,js]
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--------------------------------------------------
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GET /_cluster/state?filter_path=metadata.indices.*.state,-metadata.indices.logstash-*
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--------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT index-1\nPUT index-2\nPUT index-3\nPUT logstash-2016.01\n/]
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Responds:
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[source,js]
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--------------------------------------------------
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{
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"metadata" : {
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"indices" : {
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"index-1" : {"state" : "open"},
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"index-2" : {"state" : "open"},
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"index-3" : {"state" : "open"}
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE
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Note that elasticsearch sometimes returns directly the raw value of a field,
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like the `_source` field. If you want to filter `_source` fields, you should
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consider combining the already existing `_source` parameter (see
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<<get-source-filtering,Get API>> for more details) with the `filter_path`
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parameter like this:
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[source,js]
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--------------------------------------------------
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POST /library/book?refresh
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{"title": "Book #1", "rating": 200.1}
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POST /library/book?refresh
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{"title": "Book #2", "rating": 1.7}
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POST /library/book?refresh
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{"title": "Book #3", "rating": 0.1}
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GET /_search?filter_path=hits.hits._source&_source=title&sort=rating:desc
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--------------------------------------------------
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// CONSOLE
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[source,js]
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--------------------------------------------------
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{
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"hits" : {
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"hits" : [ {
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"_source":{"title":"Book #1"}
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}, {
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"_source":{"title":"Book #2"}
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}, {
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"_source":{"title":"Book #3"}
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} ]
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}
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}
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--------------------------------------------------
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// TESTRESPONSE
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[float]
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=== Flat Settings
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The `flat_settings` flag affects rendering of the lists of settings. When
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`flat_settings` flag is `true` settings are returned in a flat format:
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[source,js]
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--------------------------------------------------
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GET twitter/_settings?flat_settings=true
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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Returns:
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[source,js]
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--------------------------------------------------
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{
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"twitter" : {
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"settings": {
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"index.number_of_replicas": "1",
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"index.number_of_shards": "1",
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"index.creation_date": "1474389951325",
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"index.uuid": "n6gzFZTgS664GUfx0Xrpjw",
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"index.version.created": ...,
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"index.provided_name" : "twitter"
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/1474389951325/$body.twitter.settings.index\\\\.creation_date/]
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// TESTRESPONSE[s/n6gzFZTgS664GUfx0Xrpjw/$body.twitter.settings.index\\\\.uuid/]
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// TESTRESPONSE[s/"index.version.created": \.\.\./"index.version.created": $body.twitter.settings.index\\\\.version\\\\.created/]
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When the `flat_settings` flag is `false` settings are returned in a more
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human readable structured format:
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[source,js]
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--------------------------------------------------
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GET twitter/_settings?flat_settings=false
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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Returns:
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[source,js]
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--------------------------------------------------
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{
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"twitter" : {
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"settings" : {
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"index" : {
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"number_of_replicas": "1",
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"number_of_shards": "1",
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"creation_date": "1474389951325",
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"uuid": "n6gzFZTgS664GUfx0Xrpjw",
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"version": {
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"created": ...
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},
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"provided_name" : "twitter"
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}
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/1474389951325/$body.twitter.settings.index.creation_date/]
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// TESTRESPONSE[s/n6gzFZTgS664GUfx0Xrpjw/$body.twitter.settings.index.uuid/]
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// TESTRESPONSE[s/"created": \.\.\./"created": $body.twitter.settings.index.version.created/]
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By default the `flat_settings` is set to `false`.
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[float]
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=== Parameters
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Rest parameters (when using HTTP, map to HTTP URL parameters) follow the
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convention of using underscore casing.
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[float]
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=== Boolean Values
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All REST APIs parameters (both request parameters and JSON body) support
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providing boolean "false" as the values: `false`, `0`, `no` and `off`.
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All other values are considered "true". Note, this is not related to
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fields within a document indexed treated as boolean fields.
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[float]
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=== Number Values
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All REST APIs support providing numbered parameters as `string` on top
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of supporting the native JSON number types.
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[[time-units]]
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[float]
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=== Time units
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Whenever durations need to be specified, e.g. for a `timeout` parameter, the duration must specify
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the unit, like `2d` for 2 days. The supported units are:
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[horizontal]
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`d`:: days
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`h`:: hours
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`m`:: minutes
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`s`:: seconds
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`ms`:: milliseconds
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`micros`:: microseconds
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`nanos`:: nanoseconds
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[[byte-units]]
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[float]
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=== Byte size units
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Whenever the byte size of data needs to be specified, eg when setting a buffer size
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parameter, the value must specify the unit, like `10kb` for 10 kilobytes. The
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supported units are:
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[horizontal]
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`b`:: Bytes
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`kb`:: Kilobytes
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`mb`:: Megabytes
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`gb`:: Gigabytes
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`tb`:: Terabytes
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`pb`:: Petabytes
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[[size-units]]
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[float]
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=== Unit-less quantities
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Unit-less quantities means that they don't have a "unit" like "bytes" or "Hertz" or "meter" or "long tonne".
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If one of these quantities is large we'll print it out like 10m for 10,000,000 or 7k for 7,000. We'll still print 87
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when we mean 87 though. These are the supported multipliers:
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[horizontal]
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``:: Single
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`k`:: Kilo
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`m`:: Mega
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`g`:: Giga
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`t`:: Tera
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`p`:: Peta
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[[distance-units]]
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[float]
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=== Distance Units
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Wherever distances need to be specified, such as the `distance` parameter in
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the <<query-dsl-geo-distance-query>>), the default unit if none is specified is
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the meter. Distances can be specified in other units, such as `"1km"` or
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`"2mi"` (2 miles).
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The full list of units is listed below:
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[horizontal]
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Mile:: `mi` or `miles`
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Yard:: `yd` or `yards`
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Feet:: `ft` or `feet`
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Inch:: `in` or `inch`
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Kilometer:: `km` or `kilometers`
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Meter:: `m` or `meters`
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Centimeter:: `cm` or `centimeters`
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Millimeter:: `mm` or `millimeters`
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Nautical mile:: `NM`, `nmi` or `nauticalmiles`
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[[fuzziness]]
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[float]
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=== Fuzziness
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Some queries and APIs support parameters to allow inexact _fuzzy_ matching,
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using the `fuzziness` parameter.
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When querying `text` or `keyword` fields, `fuzziness` is interpreted as a
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http://en.wikipedia.org/wiki/Levenshtein_distance[Levenshtein Edit Distance]
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-- the number of one character changes that need to be made to one string to
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make it the same as another string.
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The `fuzziness` parameter can be specified as:
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`0`, `1`, `2`::
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the maximum allowed Levenshtein Edit Distance (or number of edits)
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`AUTO`::
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+
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--
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generates an edit distance based on the length of the term. For lengths:
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`0..2`:: must match exactly
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`3..5`:: one edit allowed
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`>5`:: two edits allowed
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`AUTO` should generally be the preferred value for `fuzziness`.
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--
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[float]
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[[common-options-error-options]]
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=== Enabling stack traces
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By default when a request returns an error Elasticsearch doesn't include the
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stack trace of the error. You can enable that behavior by setting the
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`error_trace` url parameter to `true`. For example, by default when you send an
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invalid `size` parameter to the `_search` API:
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[source,js]
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----------------------------------------------------------------------
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POST /twitter/_search?size=surprise_me
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----------------------------------------------------------------------
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// CONSOLE
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// TEST[catch:request]
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|
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The response looks like:
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|
|
[source,js]
|
|
----------------------------------------------------------------------
|
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{
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"error" : {
|
|
"root_cause" : [
|
|
{
|
|
"type" : "illegal_argument_exception",
|
|
"reason" : "Failed to parse int parameter [size] with value [surprise_me]"
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}
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],
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"type" : "illegal_argument_exception",
|
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"reason" : "Failed to parse int parameter [size] with value [surprise_me]",
|
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"caused_by" : {
|
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"type" : "number_format_exception",
|
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"reason" : "For input string: \"surprise_me\""
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}
|
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},
|
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"status" : 400
|
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}
|
|
----------------------------------------------------------------------
|
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// TESTRESPONSE
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|
|
But if you set `error_trace=true`:
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|
|
[source,js]
|
|
----------------------------------------------------------------------
|
|
POST /twitter/_search?size=surprise_me&error_trace=true
|
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----------------------------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[catch:request]
|
|
|
|
The response looks like:
|
|
|
|
[source,js]
|
|
----------------------------------------------------------------------
|
|
{
|
|
"error": {
|
|
"root_cause": [
|
|
{
|
|
"type": "illegal_argument_exception",
|
|
"reason": "Failed to parse int parameter [size] with value [surprise_me]",
|
|
"stack_trace": "Failed to parse int parameter [size] with value [surprise_me]]; nested: IllegalArgumentException..."
|
|
}
|
|
],
|
|
"type": "illegal_argument_exception",
|
|
"reason": "Failed to parse int parameter [size] with value [surprise_me]",
|
|
"stack_trace": "java.lang.IllegalArgumentException: Failed to parse int parameter [size] with value [surprise_me]\n at org.elasticsearch.rest.RestRequest.paramAsInt(RestRequest.java:175)...",
|
|
"caused_by": {
|
|
"type": "number_format_exception",
|
|
"reason": "For input string: \"surprise_me\"",
|
|
"stack_trace": "java.lang.NumberFormatException: For input string: \"surprise_me\"\n at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)..."
|
|
}
|
|
},
|
|
"status": 400
|
|
}
|
|
----------------------------------------------------------------------
|
|
// TESTRESPONSE[s/"stack_trace": "Failed to parse int parameter.+\.\.\."/"stack_trace": $body.error.root_cause.0.stack_trace/]
|
|
// TESTRESPONSE[s/"stack_trace": "java.lang.IllegalArgum.+\.\.\."/"stack_trace": $body.error.stack_trace/]
|
|
// TESTRESPONSE[s/"stack_trace": "java.lang.Number.+\.\.\."/"stack_trace": $body.error.caused_by.stack_trace/]
|
|
|
|
[float]
|
|
=== Request body in query string
|
|
|
|
For libraries that don't accept a request body for non-POST requests,
|
|
you can pass the request body as the `source` query string parameter
|
|
instead.
|
|
|
|
[[url-access-control]]
|
|
== URL-based access control
|
|
|
|
Many users use a proxy with URL-based access control to secure access to
|
|
Elasticsearch indices. For <<search-multi-search,multi-search>>,
|
|
<<docs-multi-get,multi-get>> and <<docs-bulk,bulk>> requests, the user has
|
|
the choice of specifying an index in the URL and on each individual request
|
|
within the request body. This can make URL-based access control challenging.
|
|
|
|
To prevent the user from overriding the index which has been specified in the
|
|
URL, add this setting to the `config.yml` file:
|
|
|
|
rest.action.multi.allow_explicit_index: false
|
|
|
|
The default value is `true`, but when set to `false`, Elasticsearch will
|
|
reject requests that have an explicit index specified in the request body.
|