Exclude missing core jar from elasticsearch import.

Convert repository urls to HTTPS.
Conjars is still HTTP because they do not have HTTPS enabled on their site.

Fixes the current build failures and fixes elastic#1083

build.gradle

@@ -5,7 +5,7 @@ description = 'Elasticsearch for Apache Hadoop'
 buildscript {
     repositories {
         mavenCentral()
-        maven { url 'http://repo.spring.io/plugins-release' }
+        maven { url 'https://repo.spring.io/plugins-release' }
     }
     dependencies {
         classpath('org.springframework.build.gradle:propdeps-plugin:0.0.7')
@@ -20,17 +20,15 @@ allprojects {
       // cascading
       maven { url "http://conjars.org/repo" }
       // storm dependencies
-      maven { url "http://clojars.org/repo" }
-      maven { url 'http://repo.spring.io/plugins-release' }
+      maven { url "https://clojars.org/repo" }
+      maven { url 'https://repo.spring.io/plugins-release' }
 
-      // Hive depends on JDO ec2 missing from Maven Central
-      maven { url "http://www.datanucleus.org/downloads/maven2" }
-      maven { url "http://oss.sonatype.org/content/groups/public/" }
+      maven { url "https://oss.sonatype.org/content/groups/public/" }
 
       // For Elasticsearch snapshots.
       maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
       // For Lucene Snapshots. See org.elasticsearch.gradle.BuildPlugin#configureRepositories for why we may need this.
-      maven { url "http://s3.amazonaws.com/download.elasticsearch.org/lucenesnapshots/7deca62" }
+      maven { url "https://s3.amazonaws.com/download.elasticsearch.org/lucenesnapshots/7deca62" }
     }
 
     apply plugin: "java"
@@ -128,7 +126,7 @@ ext.manifestTemplate = manifest {
         attributes["Created-By"] = "${System.getProperty("java.version")} (${System.getProperty("java.specification.vendor")})"
         attributes['Implementation-Title'] = project.name
         attributes['Implementation-Version'] = project.version
-        attributes['Implementation-URL'] = "http://github.com/elastic/elasticsearch-hadoop"
+        attributes['Implementation-URL'] = "https://github.com/elastic/elasticsearch-hadoop"
         attributes['Implementation-Vendor'] = "Elastic"
         attributes['Implementation-Vendor-Id'] = "org.elasticsearch.hadoop"
 
@@ -180,6 +178,7 @@ allprojects { Project project ->
         testCompile("org.elasticsearch:elasticsearch:${elasticsearchVersion}") {
             exclude group: "org.apache.logging.log4j", module: "log4j-api"
             exclude group: "org.elasticsearch", module: "elasticsearch-cli"
+            exclude group: "org.elasticsearch", module: "elasticsearch-core"
         }
         testRuntime "org.slf4j:slf4j-log4j12:1.7.6"
         testRuntime "org.apache.logging.log4j:log4j-api:$log4jVersion"
@@ -294,16 +293,14 @@ allprojects { Project project ->
             ]
 
             links = [
-                "http://docs.oracle.com/javase/6/docs/api/",
-                "http://commons.apache.org/proper/commons-logging/apidocs/",
-                "http://hadoop.apache.org/docs/stable2/api/",
-                //"http://hbase.apache.org/apidocs/",
-                "http://pig.apache.org/docs/r0.15.0/api/",
-                // r0.13.1 is invalid as it does not provide the package list
-                "http://hive.apache.org/javadocs/r1.2.1/api/",
+                "https://docs.oracle.com/javase/6/docs/api/",
+                "https://commons.apache.org/proper/commons-logging/apidocs/",
+                "https://hadoop.apache.org/docs/stable2/api/",
+                "https://pig.apache.org/docs/r0.15.0/api/",
+                "https://hive.apache.org/javadocs/r1.2.1/api/",
                 "http://docs.cascading.org/cascading/2.6/javadoc/",
-                "http://spark.apache.org/docs/latest/api/java/",
-                "http://storm.apache.org/releases/current/javadocs/"
+                "https://spark.apache.org/docs/latest/api/java/",
+                "https://storm.apache.org/releases/current/javadocs/"
             ]
 
             excludes = [