show_idx_doc_sources_all_k8sns_cnts_hourly show range of hour usage instead of just 3hrs

[slmingol]

Make this do a range of hours, say 3-6 hours instead of static 3hrs.

$ show_idx_doc_sources_all_k8sns_cnts_hourly p filebeat-60d*


k8s document sources (counts - hourly)
======================================



k8sns                             totalDocs   2020-10-11T13:00:00.000Z  2020-10-11T14:00:00.000Z  2020-10-11T15:00:00.000Z  2020-10-11T16:00:00.000Z
==========                        ==========  ==========                ==========                ==========                ==========
message-search                    30044371    3163261                   10570848                  9478162                   6832100
metrics-elasticsearch             29726277    2784447                   10303094                  10050351                  6588385
mdr-generator                     15793921    898376                    4926714                   5876174                   4092657
mdr-generator-uat                 15684453    895643                    4878013                   5830285                   4080512
stirrer                           14457999    818285                    4071963                   5127993                   4439758
http-voice-v2                     11154926    573337                    3497223                   4098046                   2986320
big-dipper                        9321138     556520                    2670072                   3441963                   2652583
vapor                             7887501     446068                    2218096                   2800567                   2422770
one-id                            2459552     201454                    821325                    823098                    613675
one-id-uat                        1400018     121914                    467735                    467498                    342871
gcac                              1215816     70591                     382601                    446618                    316006
kafka-c3                          1148928     144257                    416836                    332248                    255587
one-id-ldap                       1039210     90544                     347089                    347049                    254528
one-id-ldap-uat                   1039186     90571                     347063                    347073                    254479
datadog                           765584      65963                     255331                    257042                    187248
trunkgroup-consumer               714077      63832                     239532                    238260                    172453
kube-service-catalog              658243      55581                     222142                    218196                    162324
kafka-connect                     632554      53654                     224461                    222970                    131469
correlator-staging                309099      26597                     103149                    103344                    76009
ksql-server                       305850      4885                      71257                     163578                    66130
voice-media-service               281898      20572                     89036                     96238                     76052
tooling-pollers                   257364      22219                     85981                     85963                     63201
correlator                        248236      21635                     82716                     83189                     60696
ultratrace                        170062      14382                     54999                     58038                     42643
one-id-jfk-debug                  137935      11710                     46589                     46330                     33306
metricbeat                        110055      9593                      36757                     36759                     26946
openshift-sdn                     103233      8885                      33969                     34079                     26300
nirds                             92783       5668                      30660                     32167                     24288
kube-system                       84567       7375                      28150                     28073                     20969
filebeat                          78349       6234                      25882                     26663                     19570
vps                               77286       6732                      25800                     25817                     18937
moneymaker-uep                    70099       5929                      23390                     23615                     17165
clec-kafka-search                 60167       5224                      20107                     20103                     14733
moneymaker-provisioning           46098       4018                      15406                     15392                     11282
moneymaker-proxy                  43790       3793                      14425                     14658                     10914
one-id-okta-uat                   41715       3621                      13952                     13952                     10190
one-id-okta                       41640       3606                      13903                     13918                     10213
cnam                              41596       2227                      12419                     14333                     12617
gsx-sbc-poller                    38406       3285                      12822                     12830                     9469
openshift-monitoring              38283       3274                      12701                     12685                     9623
heartbeat                         35210       3058                      11597                     11853                     8702
apdialog                          34936       3150                      11826                     11533                     8427
awx                               31763       2758                      10604                     10636                     7765
backoffice-kafka-search           30623       2691                      10287                     10155                     7490
openshift-ansible-service-broker  27706       2427                      9248                      9255                      6776
metrics                           26079       2924                      8489                      8467                      6199
activecalls                       24747       2880                      8015                      7694                      6158
sysdig-agent                      20632       1613                      6488                      7273                      5258
moneymaker-discounting            20464       1786                      6832                      6832                      5014
identity-mgmt                     18303       1220                      6103                      6101                      4879