Streamsx-elasticsearch

This release includes the following changes

ad24945 Add docu on index creation, resolves 31
bf49350 Add docs for SSL usage, add Whats new, resolves 30
258115c reduce trace level
c0dc3e0 resolves 29
12f1ed3 clean-up generated class files
74cbb54 Fix spldoc build directory
e2e1200 update test script
ee8d477 test scripts updated for icp

This release contains incompatible changes. For details see [issue 22](https://github.com/IBMStreams/streamsx.elasticsearch/issues/22)

**This release supports the following new features**
* Only uses the REST API to access the elasticsearch server, the transport client has been removed
* Support connecting to multiple cluster nodes
* Support consistent region to allow for at-least-once or exactly-once semantic where feasible
* Support SSL connections to cluster nodes
* Support Streams application configuration
* Includes a regression testsuite

With this release the Elaticsearch client library versions are updated as listed below.

1) The ElasticsearchIndex operator now uses the transport client version 6.3.2 so it might be used with ES 6.x servers. Tested successfully with ES 6.2.2. It will not work anymore with ES 5.x servers.

2) The ElasticsearchRestIndex operator now uses the JEST client version 6.3.1. It can be used with ES 5.x and 6.x

The binary version is compiled on RHEL7/x86_64

Updated the client version to 5.5.3. Tested with Server version 5.5.3

The binary is compiled for RedHat7/x86

Dump your data into Elasticsearch v5.4.2 for further processing.