LOG-1370 Change name of elasticsearch.indexKey to structuredIndexKey

[alanconway]

In line with updated proposal: openshift/enhancements#780

/cc @vimalk78
/assign @jcantril
/assign @jcantrill

[openshift-ci]

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In response to this:

In line with updated proposal: openshift/enhancements#780

/cc @vimalk78
/assign @jcantril
/assign @jcantrill

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[vimalk78]

/lgtm

[openshift-ci]

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