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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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-
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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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-
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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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-
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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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@@ -167,5 +182,7 @@ had a value.
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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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