Relax restrictions on minimum memory

[Linary]

Improve #682

Change-Id: I92ae91b0ab5076566fcbbe10d4d48122ffd9dde5

[codecov]

Codecov Report

Merging #689 into master will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff            @@
##             master    #689   +/-   ##
========================================
  Coverage      74.3%   74.3%           
  Complexity     4089    4089           
========================================
  Files           220     220           
  Lines         17917   17917           
  Branches       2571    2571           
========================================
  Hits          13314   13314           
  Misses         3247    3247           
  Partials       1356    1356

Impacted Files	Coverage Δ	Complexity Δ
...va/com/baidu/hugegraph/structure/HugeFeatures.java	27.71% <0%> (ø)	2 <0> (ø)	⬇️
...egraph/traversal/optimize/HugeScriptTraversal.java	78.04% <0%> (ø)	5 <0> (ø)	⬇️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	80.71% <100%> (ø)	176 <0> (ø)	⬇️

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[javeme]

please rebase