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Migrate scripted metric aggregation scripts to ScriptContext design (#30111)

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* Migrate scripted metric aggregation scripts to ScriptContext design #29328

* Rename new script context container class and add clarifying comments to remaining references to params._agg(s)

* Misc cleanup: make mock metric agg script inner classes static

* Move _score to an accessor rather than an arg for scripted metric agg scripts

This causes the score to be evaluated only when it's used.

* Documentation changes for params._agg -> agg

* Migration doc addition for scripted metric aggs _agg object change

* Rename "agg" Scripted Metric Aggregation script context variable to "state"

* Rename a private base class from ...Agg to ...State that I missed in my last commit

* Clean up imports after merge
This commit is contained in:
Jonathan Little 2018-06-25 04:01:33 -07:00 • committed by Colin Goodheart-Smithe
parent 8b698f0bce
commit 8e4768890a
13 changed files with 619 additions and 111 deletions
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18
docs/java-api/aggregations/metrics/scripted-metric-aggregation.asciidoc
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@ -13,8 +13,8 @@ Here is an example on how to create the aggregation request:
--------------------------------------------------
ScriptedMetricAggregationBuilder aggregation = AggregationBuilders
.scriptedMetric("agg")
.initScript(new Script("params._agg.heights = []"))
.mapScript(new Script("params._agg.heights.add(doc.gender.value == 'male' ? doc.height.value : -1.0 * doc.height.value)"));
.initScript(new Script("state.heights = []"))
.mapScript(new Script("state.heights.add(doc.gender.value == 'male' ? doc.height.value : -1.0 * doc.height.value)"));
--------------------------------------------------
You can also specify a `combine` script which will be executed on each shard:
@ -23,9 +23,9 @@ You can also specify a `combine` script which will be executed on each shard:
--------------------------------------------------
ScriptedMetricAggregationBuilder aggregation = AggregationBuilders
.scriptedMetric("agg")
.initScript(new Script("params._agg.heights = []"))
.mapScript(new Script("params._agg.heights.add(doc.gender.value == 'male' ? doc.height.value : -1.0 * doc.height.value)"))
.combineScript(new Script("double heights_sum = 0.0; for (t in params._agg.heights) { heights_sum += t } return heights_sum"));
.initScript(new Script("state.heights = []"))
.mapScript(new Script("state.heights.add(doc.gender.value == 'male' ? doc.height.value : -1.0 * doc.height.value)"))
.combineScript(new Script("double heights_sum = 0.0; for (t in state.heights) { heights_sum += t } return heights_sum"));
--------------------------------------------------
You can also specify a `reduce` script which will be executed on the node which gets the request:
@ -34,10 +34,10 @@ You can also specify a `reduce` script which will be executed on the node which
--------------------------------------------------
ScriptedMetricAggregationBuilder aggregation = AggregationBuilders
.scriptedMetric("agg")
.initScript(new Script("params._agg.heights = []"))
.mapScript(new Script("params._agg.heights.add(doc.gender.value == 'male' ? doc.height.value : -1.0 * doc.height.value)"))
.combineScript(new Script("double heights_sum = 0.0; for (t in params._agg.heights) { heights_sum += t } return heights_sum"))
.reduceScript(new Script("double heights_sum = 0.0; for (a in params._aggs) { heights_sum += a } return heights_sum"));
.initScript(new Script("state.heights = []"))
.mapScript(new Script("state.heights.add(doc.gender.value == 'male' ? doc.height.value : -1.0 * doc.height.value)"))
.combineScript(new Script("double heights_sum = 0.0; for (t in state.heights) { heights_sum += t } return heights_sum"))
.reduceScript(new Script("double heights_sum = 0.0; for (a in states) { heights_sum += a } return heights_sum"));
--------------------------------------------------