Recommendations:

Remove the all and clear flags. Default to return all by default, unless specific metrics specified.

Change the path format to:

/_nodes/{nodes}/stats/{metric}

where:

• {nodes}: comma-delimited list of nodes or blank
• {metric} is blank or comma-delimited list of metrics

Metrics can be any of:

• http
• jvm
• network
• os
• process
• thread_pool
• transport
• fs
• indices

If indices is specified in the metrics list, then the path expands to accept:

/_nodes/{nodes}/{metrics}/stats/indices,fs,jvm/{index-metrics}

where:

• {index} is a comma-delimited list of indices, _all, or blank
• {index-metrics} is a comma-delimited list of the metrics specified in Changes to the indices stats API #4054 or blank for all

and the query-string options accepted by indices statistics in #4054 are also accepted here