treat IndexAlreadyExistsException more robustly
treat IndexAlreadyExistsException more robustly

it seems that since ES 0.90.6 the error is:
"IndexAlreadyExistsException[[graphite_metrics] already exists]"
whereas it used to be:
"IndexAlreadyExistsException[[graphite_metrics] Already exists]"

now we just check for "IndexAlreadyExistsException" which should
suffice

nickman/anthracite,jjardel/anthracite,square-root/anthracite,nickman/anthracite,Dieterbe/anthracite,nickman/anthracite,jjardel/anthracite,square-root/anthracite,nickman/anthracite,Dieterbe/anthracite,jjardel/anthracite,square-root/anthracite,Dieterbe/anthracite,square-root/anthracite,Dieterbe/anthracite,jjardel/anthracite