Added source field option for CloudSearch define-index-field

Author: akhill10

awscli/customizations/cloudsearch.py

@@ -98,6 +98,9 @@ def index_hydrate(params, container, cli_type, key, value):
                                               "hydrate": index_hydrate}),
                 ("IntOptions.SortEnabled", {"name": "sort-enabled",
                                             "hydrate": index_hydrate}),
+                ("IntOptions.SourceField", {"name": "source-field",
+                                            "type": "string",
+                                            "hydrate": index_hydrate }),
                 ("TextOptions.HighlightEnabled", {"name": "highlight-enabled",
                                                   "hydrate": index_hydrate}),
                 ("TextOptions.AnalysisScheme", {"name": "analysis-scheme",