Fixes bug 960690 - Updated pyelasticsearch to version 0.6.1.
Fix for bug 960621 - compensates for possible NULLs in fields
Migration for bug 960621
Merge pull request #1801 from selenamarie/bug960621-tcbs-null-value-errors

Bug960621 tcbs null value errors
Merge pull request #1800 from AdrianGaudebert/960690-pyelasticsearch-0.6.1

Fixes bug 960690 - Updated pyelasticsearch to version 0.6.1.