[dbnode] Repopulate cached searched in index active block

[rallen090]

What this PR does / why we need it:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:

Does this PR require updating code package or user-facing documentation?:

[codecov]

Codecov Report

Merging #3671 (9873beb) into master (5d60010) will increase coverage by 0.1%.
The diff coverage is 41.6%.

@@           Coverage Diff            @@
##           master   #3671     +/-   ##
========================================
+ Coverage    56.5%   56.7%   +0.1%     
========================================
  Files         552     552             
  Lines       63354   62684    -670     
========================================
- Hits        35836   35562    -274     
+ Misses      24343   23951    -392     
+ Partials     3175    3171      -4     

Flag	Coverage Δ
aggregator	61.4% <ø> (ø)
cluster	∅ <ø> (∅)
collector	58.4% <ø> (ø)
dbnode	60.6% <41.6%> (+0.3%)	⬆️
m3em	46.4% <ø> (ø)
metrics	19.7% <ø> (ø)
msg	74.2% <ø> (-0.2%)	⬇️

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