[Transform] implement node.transform to control where to run a transform#52712

Merged

hendrikmuhs merged 16 commits intoelastic:masterfrom hendrikmuhs:transform-node-attributes

Mar 2, 2020

+744-260

Commits on Feb 28, 2020

implement transform node attributes to disable transform on certain nodes
Hendrik Muhs
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checkstyle
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prepare BWC
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document node.transform
Hendrik Muhs
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check only for 8.0.0 until its backported
Hendrik Muhs
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fix optional boolean value
Hendrik Muhs
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change node.transform, so that dedicated transform nodes are possible
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fix NPE in usage retrieval if task state is null
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avoid network call to all nodes in case no tasks are running
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Update docs/reference/settings/transform-settings.asciidoc

Hendrik Muhs
and
droberts195
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add a note for dedicated coordinating/master nodes
Hendrik Muhs
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Revert "avoid network call to all nodes in case no tasks are running"
Hendrik Muhs
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Update docs/reference/settings/transform-settings.asciidoc

szabosteve
authored and
Hendrik Muhs
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Update TransformPersistentTasksExecutor.java
Hendrik Muhs
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Update Transform.java
Hendrik Muhs
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fix tests after renamings
Hendrik Muhs
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