[DOC] Adding version compatibility matrix for Spark in installation d…

…ocumentation.

fixes #890

docs/src/reference/asciidoc/core/intro/download.adoc

@@ -63,12 +63,25 @@ These are available under the same `groupId`, using an `artifactId` with the pat
 ----
 <dependency>
   <groupId>org.elasticsearch</groupId>
-  <artifactId>elasticsearch-spark_2.10<1></artifactId>
+  <artifactId>elasticsearch-spark-20<1>_2.10<2></artifactId>
   <version>{ver}</version>
 </dependency>
 ----
 
-<1> 'spark' artifact. Notice the `_2.10` suffix which indicates the Scala version compatible with the artifact. Currently it is the same as the version used by Spark itself.
+<1> 'spark' artifact. Notice the `-20` part of the suffix which indicates the Spark version compatible with the artifact. Use `20` for Spark 2.0+ and `13` for Spark 1.3-1.6.
+<2> Notice the `_2.10` suffix which indicates the Scala version compatible with the artifact. Currently it is the same as the version used by Spark itself.
+
+The Spark connector framework is the most sensitive to version incompatibilities. For your convenience, a version compatibility matrix has been provided below:
+[cols="2,2,10",options="header",]
+|==========================================================
+| Spark Version | Scala Version | ES-Hadoop Artifact ID
+| 1.0 - 1.2 | 2.10 | <unsupported>
+| 1.0 - 1.2 | 2.11 | <unsupported>
+| 1.3 - 1.6 | 2.10 | elasticsearch-spark-13_2.10
+| 1.3 - 1.6 | 2.11 | elasticsearch-spark-13_2.11
+| 2.0+ | 2.10 | elasticsearch-spark-20_2.10
+| 2.0+ | 2.11 | elasticsearch-spark-20_2.11
+|==========================================================
 
 .Cascading
 ["source","xml",subs="attributes"]