In order to understand the status of the Elastic Cluster shard recovery (how many shards and in what percentage of data are still to be consumed by the elastic node):
watch -n 1 -d "curl -sS localhost:9200/_cat/recovery | grep -v done | sort"
curl -sS localhost:2013/_cat/recovery | grep -v done | sort
chat_events_2018_10 0 1080986 replica index svpr-els219 svpr-els222 n/a n/a 99 99.0% 9245443931 99.4% 99 9245443931 0 100.0% 0
chat_events_2018_10 12 880628 replica index svpr-els219 svpr-els225 n/a n/a 118 80.5% 9507834833 50.9% 118 9507834833 0 100.0% 0
chat_events_2018_10 4 1080998 replica index svpr-els217 svpr-els222 n/a n/a 120 98.3% 9212348531 84.1% 120 9212348531 0 0.0% 549128
chat_events_2018_10 6 48448 gateway translog avpr-els217 avpr-els217 n/a n/a 0 100.0% 0 100.0% 120 9111543410 314413 -1.0% -1
chat_events_2018_10 7 37318 gateway translog svpr-els239 svpr-els239 n/a n/a 0 100.0% 0 100.0% 119 9355121451 215907 -1.0% -1
chat_events_2018_11 15 246460 replica index svpr-els221 svpr-els230 n/a n/a 94 92.6% 7473306012 59.9% 94 7473306012 0 0.0% 207497
chat_events_2018_12 17 561707 replica index svpr-els217 svpr-els225 n/a n/a 78 83.3% 5985100320 0.1% 78 5985100320 0 100.0% 0
chat_events_2019_01 10 403900 replica index svpr-els222 svpr-els230 n/a n/a 162 68.5% 5824180424 0.3% 162 5824180424 0 0.0% 166305
chat_events_2019_02 1 377381 replica index svpr-els222 svpr-els228 n/a n/a 154 72.1% 5509742229 0.2% 154 5509742229 0 0.0% 122191
chat_events_2019_02 16 561676 replica index svpr-els220 svpr-els245 n/a n/a 150 95.3% 4684545993 80.1% 150 4684545993 0 0.0% 122191
chat_events_2019_03 3 936237 replica index svpr-els217 svpr-els242 n/a n/a 158 75.9% 5212773307 7.8% 158 5212773307 0 0.0% 1527414