[DOCS] Setting up separate Painless book.

docs/painless/index.asciidoc

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+[[painless]]
+= Painless Scripting Language
+
+:ref: https://www.elastic.co/guide/en/elasticsearch/reference
+
+include::../Versions.asciidoc[]
+
+include::painless-getting-started.asciidoc[]
+
+// include::painless-examples.asciidoc[]
+
+// include::painless-design.asciidoc[]
+
+include::painless-lang-spec.asciidoc[]
+
+include::painless-syntax.asciidoc[]
+
+include::painless-api-reference.asciidoc[]
+
+////
+Proposed Outline (WIP)
+Getting Started with Painless
+  Accessing Doc Values 
+  Updating Fields
+  Working with Dates
+  Using Regular Expressions
+  Debugging Painless Scripts
+
+Example Scripts
+  Using Painless in Script Fields
+  Using Painless in Watches
+  Using Painless in Function Score Queries
+  Using Painless in Script Queries
+  Using Painless When Updating Docs
+  Using Painless When Reindexing
+
+How Painless Works
+  Painless Architecture
+  Dispatching Functions
+
+Painless Language Specification
+Painless API
+////
+
+Painless API Reference

docs/painless/painless-api-reference.asciidoc

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+["appendix",id="painless-api-reference"]
+= Painless API Reference
+
+Painless has a strict whitelist for methods and
+classes to make sure that all painless scripts are secure and fast. Most of
+these methods are exposed directly from the JRE while others are part of
+Elasticsearch or Painless itself. Below is a list of all available methods
+grouped under the classes on which you can call them. Clicking on the method
+name takes you to the documentation for the method.
+
+NOTE: Methods defined in the JRE also have a `(java 9)` link which can be used
+to see the method's documentation in Java 9 while clicking on the method's name
+goes to the Java 8 documentation. Usually these aren't different but it is
+worth going to the version that matches the version of Java you are using to
+run Elasticsearch just in case.
+
+include::painless-api-reference/index.asciidoc[]

docs/painless/painless-api-reference/AbstractChronology.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractChronology]]++AbstractChronology++::
+* Inherits methods from ++<<painless-api-reference-Chronology,Chronology>>++

docs/painless/painless-api-reference/AbstractCollection.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractCollection]]++AbstractCollection++::
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AbstractList.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractList]]++AbstractList++::
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-List,List>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AbstractMap.SimpleEntry.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractMap-SimpleEntry]]++AbstractMap.SimpleEntry++::
+* ++[[painless-api-reference-AbstractMap-SimpleEntry-AbstractMap.SimpleEntry-1]]link:{java8-javadoc}/java/util/AbstractMap$SimpleEntry.html#AbstractMap.SimpleEntry%2Djava.util.Map$Entry%2D[AbstractMap.SimpleEntry](<<painless-api-reference-Map-Entry,Map.Entry>>)++ (link:{java9-javadoc}/java/util/AbstractMap$SimpleEntry.html#AbstractMap.SimpleEntry%2Djava.util.Map$Entry%2D[java 9])
+* ++[[painless-api-reference-AbstractMap-SimpleEntry-AbstractMap.SimpleEntry-2]]link:{java8-javadoc}/java/util/AbstractMap$SimpleEntry.html#AbstractMap.SimpleEntry%2Djava.lang.Object%2Djava.lang.Object%2D[AbstractMap.SimpleEntry](def, def)++ (link:{java9-javadoc}/java/util/AbstractMap$SimpleEntry.html#AbstractMap.SimpleEntry%2Djava.lang.Object%2Djava.lang.Object%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Map-Entry,Map.Entry>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AbstractMap.SimpleImmutableEntry.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractMap-SimpleImmutableEntry]]++AbstractMap.SimpleImmutableEntry++::
+* ++[[painless-api-reference-AbstractMap-SimpleImmutableEntry-AbstractMap.SimpleImmutableEntry-1]]link:{java8-javadoc}/java/util/AbstractMap$SimpleImmutableEntry.html#AbstractMap.SimpleImmutableEntry%2Djava.util.Map$Entry%2D[AbstractMap.SimpleImmutableEntry](<<painless-api-reference-Map-Entry,Map.Entry>>)++ (link:{java9-javadoc}/java/util/AbstractMap$SimpleImmutableEntry.html#AbstractMap.SimpleImmutableEntry%2Djava.util.Map$Entry%2D[java 9])
+* ++[[painless-api-reference-AbstractMap-SimpleImmutableEntry-AbstractMap.SimpleImmutableEntry-2]]link:{java8-javadoc}/java/util/AbstractMap$SimpleImmutableEntry.html#AbstractMap.SimpleImmutableEntry%2Djava.lang.Object%2Djava.lang.Object%2D[AbstractMap.SimpleImmutableEntry](def, def)++ (link:{java9-javadoc}/java/util/AbstractMap$SimpleImmutableEntry.html#AbstractMap.SimpleImmutableEntry%2Djava.lang.Object%2Djava.lang.Object%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Map-Entry,Map.Entry>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AbstractMap.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractMap]]++AbstractMap++::
+* Inherits methods from ++<<painless-api-reference-Map,Map>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AbstractQueue.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractQueue]]++AbstractQueue++::
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-Object,Object>>++, ++<<painless-api-reference-Queue,Queue>>++

docs/painless/painless-api-reference/AbstractSequentialList.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractSequentialList]]++AbstractSequentialList++::
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-List,List>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AbstractSet.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AbstractSet]]++AbstractSet++::
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-Object,Object>>++, ++<<painless-api-reference-Set,Set>>++

docs/painless/painless-api-reference/Annotation.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-Annotation]]++Annotation++::
+* ++[[painless-api-reference-Annotation-Annotation-1]]link:{java8-javadoc}/java/text/Annotation.html#Annotation%2Djava.lang.Object%2D[Annotation](<<painless-api-reference-Object,Object>>)++ (link:{java9-javadoc}/java/text/Annotation.html#Annotation%2Djava.lang.Object%2D[java 9])
+* ++[[painless-api-reference-Annotation-getValue-0]]def link:{java8-javadoc}/java/text/Annotation.html#getValue%2D%2D[getValue]()++ (link:{java9-javadoc}/java/text/Annotation.html#getValue%2D%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/Appendable.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-Appendable]]++Appendable++::
+* ++[[painless-api-reference-Appendable-append-3]]<<painless-api-reference-Appendable,Appendable>> link:{java8-javadoc}/java/lang/Appendable.html#append%2Djava.lang.CharSequence%2Dint%2Dint%2D[append](<<painless-api-reference-CharSequence,CharSequence>>, int, int)++ (link:{java9-javadoc}/java/lang/Appendable.html#append%2Djava.lang.CharSequence%2Dint%2Dint%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/ArithmeticException.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-ArithmeticException]]++ArithmeticException++::
+* ++[[painless-api-reference-ArithmeticException-ArithmeticException-0]]link:{java8-javadoc}/java/lang/ArithmeticException.html#ArithmeticException%2D%2D[ArithmeticException]()++ (link:{java9-javadoc}/java/lang/ArithmeticException.html#ArithmeticException%2D%2D[java 9])
+* ++[[painless-api-reference-ArithmeticException-ArithmeticException-1]]link:{java8-javadoc}/java/lang/ArithmeticException.html#ArithmeticException%2Djava.lang.String%2D[ArithmeticException](<<painless-api-reference-String,String>>)++ (link:{java9-javadoc}/java/lang/ArithmeticException.html#ArithmeticException%2Djava.lang.String%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Exception,Exception>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/ArrayDeque.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-ArrayDeque]]++ArrayDeque++::
+* ++[[painless-api-reference-ArrayDeque-ArrayDeque-0]]link:{java8-javadoc}/java/util/ArrayDeque.html#ArrayDeque%2D%2D[ArrayDeque]()++ (link:{java9-javadoc}/java/util/ArrayDeque.html#ArrayDeque%2D%2D[java 9])
+* ++[[painless-api-reference-ArrayDeque-ArrayDeque-1]]link:{java8-javadoc}/java/util/ArrayDeque.html#ArrayDeque%2Djava.util.Collection%2D[ArrayDeque](<<painless-api-reference-Collection,Collection>>)++ (link:{java9-javadoc}/java/util/ArrayDeque.html#ArrayDeque%2Djava.util.Collection%2D[java 9])
+* ++[[painless-api-reference-ArrayDeque-clone-0]]<<painless-api-reference-ArrayDeque,ArrayDeque>> link:{java8-javadoc}/java/util/ArrayDeque.html#clone%2D%2D[clone]()++ (link:{java9-javadoc}/java/util/ArrayDeque.html#clone%2D%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Deque,Deque>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-Object,Object>>++, ++<<painless-api-reference-Queue,Queue>>++

docs/painless/painless-api-reference/ArrayIndexOutOfBoundsException.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-ArrayIndexOutOfBoundsException]]++ArrayIndexOutOfBoundsException++::
+* ++[[painless-api-reference-ArrayIndexOutOfBoundsException-ArrayIndexOutOfBoundsException-0]]link:{java8-javadoc}/java/lang/ArrayIndexOutOfBoundsException.html#ArrayIndexOutOfBoundsException%2D%2D[ArrayIndexOutOfBoundsException]()++ (link:{java9-javadoc}/java/lang/ArrayIndexOutOfBoundsException.html#ArrayIndexOutOfBoundsException%2D%2D[java 9])
+* ++[[painless-api-reference-ArrayIndexOutOfBoundsException-ArrayIndexOutOfBoundsException-1]]link:{java8-javadoc}/java/lang/ArrayIndexOutOfBoundsException.html#ArrayIndexOutOfBoundsException%2Djava.lang.String%2D[ArrayIndexOutOfBoundsException](<<painless-api-reference-String,String>>)++ (link:{java9-javadoc}/java/lang/ArrayIndexOutOfBoundsException.html#ArrayIndexOutOfBoundsException%2Djava.lang.String%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Exception,Exception>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/ArrayList.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-ArrayList]]++ArrayList++::
+* ++[[painless-api-reference-ArrayList-ArrayList-0]]link:{java8-javadoc}/java/util/ArrayList.html#ArrayList%2D%2D[ArrayList]()++ (link:{java9-javadoc}/java/util/ArrayList.html#ArrayList%2D%2D[java 9])
+* ++[[painless-api-reference-ArrayList-ArrayList-1]]link:{java8-javadoc}/java/util/ArrayList.html#ArrayList%2Djava.util.Collection%2D[ArrayList](<<painless-api-reference-Collection,Collection>>)++ (link:{java9-javadoc}/java/util/ArrayList.html#ArrayList%2Djava.util.Collection%2D[java 9])
+* ++[[painless-api-reference-ArrayList-clone-0]]def link:{java8-javadoc}/java/util/ArrayList.html#clone%2D%2D[clone]()++ (link:{java9-javadoc}/java/util/ArrayList.html#clone%2D%2D[java 9])
+* ++[[painless-api-reference-ArrayList-trimToSize-0]]void link:{java8-javadoc}/java/util/ArrayList.html#trimToSize%2D%2D[trimToSize]()++ (link:{java9-javadoc}/java/util/ArrayList.html#trimToSize%2D%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Collection,Collection>>++, ++<<painless-api-reference-Iterable,Iterable>>++, ++<<painless-api-reference-List,List>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/ArrayStoreException.asciidoc

@@ -0,0 +1,9 @@
+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-ArrayStoreException]]++ArrayStoreException++::
+* ++[[painless-api-reference-ArrayStoreException-ArrayStoreException-0]]link:{java8-javadoc}/java/lang/ArrayStoreException.html#ArrayStoreException%2D%2D[ArrayStoreException]()++ (link:{java9-javadoc}/java/lang/ArrayStoreException.html#ArrayStoreException%2D%2D[java 9])
+* ++[[painless-api-reference-ArrayStoreException-ArrayStoreException-1]]link:{java8-javadoc}/java/lang/ArrayStoreException.html#ArrayStoreException%2Djava.lang.String%2D[ArrayStoreException](<<painless-api-reference-String,String>>)++ (link:{java9-javadoc}/java/lang/ArrayStoreException.html#ArrayStoreException%2Djava.lang.String%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Exception,Exception>>++, ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/Arrays.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-Arrays]]++Arrays++::
+* ++[[painless-api-reference-Arrays-asList-1]]static <<painless-api-reference-List,List>> link:{java8-javadoc}/java/util/Arrays.html#asList%2Djava.lang.Object:A%2D[asList](<<painless-api-reference-Object,Object>>[])++ (link:{java9-javadoc}/java/util/Arrays.html#asList%2Djava.lang.Object:A%2D[java 9])
+* ++[[painless-api-reference-Arrays-deepEquals-2]]static boolean link:{java8-javadoc}/java/util/Arrays.html#deepEquals%2Djava.lang.Object:A%2Djava.lang.Object:A%2D[deepEquals](<<painless-api-reference-Object,Object>>[], <<painless-api-reference-Object,Object>>[])++ (link:{java9-javadoc}/java/util/Arrays.html#deepEquals%2Djava.lang.Object:A%2Djava.lang.Object:A%2D[java 9])
+* ++[[painless-api-reference-Arrays-deepHashCode-1]]static int link:{java8-javadoc}/java/util/Arrays.html#deepHashCode%2Djava.lang.Object:A%2D[deepHashCode](<<painless-api-reference-Object,Object>>[])++ (link:{java9-javadoc}/java/util/Arrays.html#deepHashCode%2Djava.lang.Object:A%2D[java 9])
+* ++[[painless-api-reference-Arrays-deepToString-1]]static <<painless-api-reference-String,String>> link:{java8-javadoc}/java/util/Arrays.html#deepToString%2Djava.lang.Object:A%2D[deepToString](<<painless-api-reference-Object,Object>>[])++ (link:{java9-javadoc}/java/util/Arrays.html#deepToString%2Djava.lang.Object:A%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AttributedCharacterIterator.Attribute.asciidoc

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+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AttributedCharacterIterator-Attribute]]++AttributedCharacterIterator.Attribute++::
+** [[painless-api-reference-AttributedCharacterIterator-Attribute-INPUT_METHOD_SEGMENT]]static <<painless-api-reference-AttributedCharacterIterator-Attribute,AttributedCharacterIterator.Attribute>> link:{java8-javadoc}/java/text/AttributedCharacterIterator$Attribute.html#INPUT_METHOD_SEGMENT[INPUT_METHOD_SEGMENT] (link:{java9-javadoc}/java/text/AttributedCharacterIterator$Attribute.html#INPUT_METHOD_SEGMENT[java 9])
+** [[painless-api-reference-AttributedCharacterIterator-Attribute-LANGUAGE]]static <<painless-api-reference-AttributedCharacterIterator-Attribute,AttributedCharacterIterator.Attribute>> link:{java8-javadoc}/java/text/AttributedCharacterIterator$Attribute.html#LANGUAGE[LANGUAGE] (link:{java9-javadoc}/java/text/AttributedCharacterIterator$Attribute.html#LANGUAGE[java 9])
+** [[painless-api-reference-AttributedCharacterIterator-Attribute-READING]]static <<painless-api-reference-AttributedCharacterIterator-Attribute,AttributedCharacterIterator.Attribute>> link:{java8-javadoc}/java/text/AttributedCharacterIterator$Attribute.html#READING[READING] (link:{java9-javadoc}/java/text/AttributedCharacterIterator$Attribute.html#READING[java 9])
+* Inherits methods from ++<<painless-api-reference-Object,Object>>++

docs/painless/painless-api-reference/AttributedCharacterIterator.asciidoc

@@ -0,0 +1,14 @@
+////
+Automatically generated by PainlessDocGenerator. Do not edit.
+Rebuild by running `gradle generatePainlessApi`.
+////
+
+[[painless-api-reference-AttributedCharacterIterator]]++AttributedCharacterIterator++::
+* ++[[painless-api-reference-AttributedCharacterIterator-getAllAttributeKeys-0]]<<painless-api-reference-Set,Set>> link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getAllAttributeKeys%2D%2D[getAllAttributeKeys]()++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getAllAttributeKeys%2D%2D[java 9])
+* ++[[painless-api-reference-AttributedCharacterIterator-getAttribute-1]]def link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getAttribute%2Djava.text.AttributedCharacterIterator$Attribute%2D[getAttribute](<<painless-api-reference-AttributedCharacterIterator-Attribute,AttributedCharacterIterator.Attribute>>)++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getAttribute%2Djava.text.AttributedCharacterIterator$Attribute%2D[java 9])
+* ++[[painless-api-reference-AttributedCharacterIterator-getAttributes-0]]<<painless-api-reference-Map,Map>> link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getAttributes%2D%2D[getAttributes]()++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getAttributes%2D%2D[java 9])
+* ++[[painless-api-reference-AttributedCharacterIterator-getRunLimit-0]]int link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getRunLimit%2D%2D[getRunLimit]()++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getRunLimit%2D%2D[java 9])
+* ++[[painless-api-reference-AttributedCharacterIterator-getRunLimit-1]]int link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getRunLimit%2Djava.util.Set%2D[getRunLimit](<<painless-api-reference-Set,Set>>)++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getRunLimit%2Djava.util.Set%2D[java 9])
+* ++[[painless-api-reference-AttributedCharacterIterator-getRunStart-0]]int link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getRunStart%2D%2D[getRunStart]()++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getRunStart%2D%2D[java 9])
+* ++[[painless-api-reference-AttributedCharacterIterator-getRunStart-1]]int link:{java8-javadoc}/java/text/AttributedCharacterIterator.html#getRunStart%2Djava.util.Set%2D[getRunStart](<<painless-api-reference-Set,Set>>)++ (link:{java9-javadoc}/java/text/AttributedCharacterIterator.html#getRunStart%2Djava.util.Set%2D[java 9])
+* Inherits methods from ++<<painless-api-reference-CharacterIterator,CharacterIterator>>++, ++<<painless-api-reference-Object,Object>>++