[docs] fix typo in getting-started

Closes #8354
[TRANSLOG] Translog leaks filehandles if it's corrupted or truncated

If the translog file is corrupted or truncated the stream is never closed
and the filehandle leaks. This commit closes the stream in the case of an
exception.
backward compatibility test to illustrate problem
Indices API: Fixed backward compatibility issue

If a 1.4 node needs to forward a GET index API call to a <1.4 master it cannot use the GET index API endpoints as the master has no knowledge of it. This change detects that the master does not understand the initial request and instead tries it again using the old APIs. If these calls also do not work, an error is returned

Closes #8364
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