Standardized Index Fields for CrawlExchange and CrawlFileSystem

Both CrawlExchange and CrawlFileSystem (with --crawl-pst and text extraction included in the command) use different fields to store email addresses:

CrawlExchange	CrawlFileSystem (with --crawl-pst with text extraction)
receivedBy	EmailTo
fromAddress	EmailFrom
ccRecipients	EmailToCc

For consistency, any Cognitive Toolkit operation that stores email addresses in an index will use the following standardized fields:

Standard Fields	Description
fromAddress	Contains the email address of the person who actually sent the email. In Microsoft Exchange, this is the SenderEmailField value.
senderAddress	Contains the email address of the person on whose behalf the email was sent. In Microsoft Exchange, this is the SentOnBehalfOfEmailAddress value.
receivedBy	Contains the email address(es) of the person(s) who received the email.
ccRecipients	Contains the email address(es) of the person(s) who were copied on the email.
bccRecipients	Contains the email address(es) of the person(s) who were blind copied on the email.
toRecipients	Contains the email address(es) of the person(s) who were sent the email.