Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Set version to 2.15.13-SNAPSHOT
  Set version to 2.15.12
  Set version to 2.14.19
  Upgrade JGit to 4.9.9.201903122025-r
  Upgrade JGit to 4.7.8.201903121755-r
  ElasticContainer: Update the 5.6 version to latest
  WORKSPACE: Update the testcontainers version to latest
  WORKSPACE: Update the testcontainers version to latest
  WORKSPACE: Fix the httpcore-nio reference typo

Change-Id: I7a706fcb71dd50c266ecd091b48c085c6e38028b
diff --git a/WORKSPACE b/WORKSPACE
index 47ead15d..958b271 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1087,7 +1087,7 @@
     sha1 = "76716d529710fc03d1d429b43e3cedd4419f78d4",
 )
 
-# When upgrading elasticsearch-rest-client, also upgrade http-niocore
+# When upgrading elasticsearch-rest-client, also upgrade httpcore-nio
 # and httpasyncclient as necessary.
 maven_jar(
     name = "elasticsearch-rest-client",
@@ -1103,18 +1103,18 @@
     sha1 = "0f5a654e4675769c716e5b387830d19b501ca191",
 )
 
-TESTCONTAINERS_VERSION = "1.10.3"
+TESTCONTAINERS_VERSION = "1.10.6"
 
 maven_jar(
     name = "testcontainers",
     artifact = "org.testcontainers:testcontainers:" + TESTCONTAINERS_VERSION,
-    sha1 = "e561ce99fc616b383d85f35ce881e58e8de59ae7",
+    sha1 = "435c94ec099e229e62295cec4feec91c192aa764",
 )
 
 maven_jar(
     name = "testcontainers-elasticsearch",
     artifact = "org.testcontainers:elasticsearch:" + TESTCONTAINERS_VERSION,
-    sha1 = "0cb114ecba0ed54a116e2be2f031bc45ca4cbfc8",
+    sha1 = "143a88bd8f5c5a917e5bac5a728bb6a7fc54a50c",
 )
 
 maven_jar(