parent
aafd7f90fd
commit
268923ebdc
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@ -31,7 +31,6 @@ buildRestTests.expectedUnconvertedCandidates = [
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'reference/aggregations/bucket/significantterms-aggregation.asciidoc',
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'reference/aggregations/bucket/terms-aggregation.asciidoc',
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'reference/aggregations/matrix/stats-aggregation.asciidoc',
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'reference/aggregations/metrics/extendedstats-aggregation.asciidoc',
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'reference/aggregations/metrics/percentile-aggregation.asciidoc',
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'reference/aggregations/metrics/percentile-rank-aggregation.asciidoc',
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'reference/aggregations/metrics/scripted-metric-aggregation.asciidoc',
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@ -9,12 +9,16 @@ Assuming the data consists of documents representing exams grades (between 0 and
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[source,js]
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--------------------------------------------------
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GET /exams/_search
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{
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"size": 0,
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"aggs" : {
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"grades_stats" : { "extended_stats" : { "field" : "grade" } }
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:exams]
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The above aggregation computes the grades statistics over all documents. The aggregation type is `extended_stats` and the `field` setting defines the numeric field of the documents the stats will be computed on. The above will return the following:
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@ -25,23 +29,24 @@ The above aggregation computes the grades statistics over all documents. The agg
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...
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"aggregations": {
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"grade_stats": {
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"count": 9,
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"min": 72,
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"max": 99,
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"avg": 86,
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"sum": 774,
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"sum_of_squares": 67028,
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"variance": 51.55555555555556,
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"std_deviation": 7.180219742846005,
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"grades_stats": {
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"count": 2,
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"min": 50.0,
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"max": 100.0,
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"avg": 75.0,
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"sum": 150.0,
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"sum_of_squares": 12500.0,
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"variance": 625.0,
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"std_deviation": 25.0,
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"std_deviation_bounds": {
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"upper": 100.36043948569201,
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"lower": 71.63956051430799
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"upper": 125.0,
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"lower": 25.0
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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": $body.took,"timed_out": false,"_shards": $body._shards,"hits": $body.hits,/]
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The name of the aggregation (`grades_stats` above) also serves as the key by which the aggregation result can be retrieved from the returned response.
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@ -52,7 +57,9 @@ three standard deviations, you can set `sigma` in the request:
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[source,js]
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--------------------------------------------------
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GET /exams/_search
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{
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"size": 0,
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"aggs" : {
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"grades_stats" : {
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"extended_stats" : {
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@ -63,6 +70,8 @@ three standard deviations, you can set `sigma` in the request:
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:exams]
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<1> `sigma` controls how many standard deviations +/- from the mean should be displayed
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`sigma` can be any non-negative double, meaning you can request non-integer values such as `1.5`. A value of `0` is valid, but will simply
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@ -82,9 +91,9 @@ Computing the grades stats based on a script:
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[source,js]
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--------------------------------------------------
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GET /exams/_search
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{
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...,
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"size": 0,
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"aggs" : {
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"grades_stats" : {
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"extended_stats" : {
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@ -97,14 +106,16 @@ Computing the grades stats based on a script:
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:exams]
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This will interpret the `script` parameter as an `inline` script with the `painless` script language and no script parameters. To use a file script use the following syntax:
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[source,js]
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--------------------------------------------------
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GET /exams/_search
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{
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...,
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"size": 0,
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"aggs" : {
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"grades_stats" : {
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"extended_stats" : {
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@ -119,6 +130,8 @@ This will interpret the `script` parameter as an `inline` script with the `painl
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:exams,stored_example_script]
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===== Value Script
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@ -126,20 +139,18 @@ It turned out that the exam was way above the level of the students and a grade
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[source,js]
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--------------------------------------------------
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GET /exams/_search
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{
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"size": 0,
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"aggs" : {
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...
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"aggs" : {
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"grades_stats" : {
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"extended_stats" : {
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"field" : "grade",
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"script" : {
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"lang" : "painless",
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"source": "_value * params.correction",
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"params" : {
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"correction" : 1.2
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}
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"grades_stats" : {
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"extended_stats" : {
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"field" : "grade",
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"script" : {
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"lang" : "painless",
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"source": "_value * params.correction",
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"params" : {
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"correction" : 1.2
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}
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}
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}
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@ -147,6 +158,8 @@ It turned out that the exam was way above the level of the students and a grade
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:exams]
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==== Missing value
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@ -156,7 +169,9 @@ had a value.
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[source,js]
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--------------------------------------------------
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GET /exams/_search
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{
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"size": 0,
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"aggs" : {
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"grades_stats" : {
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"extended_stats" : {
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:exams]
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<1> Documents without a value in the `grade` field will fall into the same bucket as documents that have the value `0`.
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