LogQuery remove unused field

[rainbend]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• Update the CHANGES log.

[wu-sheng]

LGTM. FYI @Fine0830

[codecov]

Codecov Report

Merging #6246 (90328ef) into master (777c670) will increase coverage by 0.00%.
The diff coverage is 16.66%.

@@            Coverage Diff            @@
##             master    #6246   +/-   ##
=========================================
  Coverage     52.47%   52.48%           
+ Complexity     3788     3785    -3     
=========================================
  Files          1747     1747           
  Lines         37009    37008    -1     
  Branches       4093     4093           
=========================================
+ Hits          19422    19423    +1     
+ Misses        16624    16622    -2     
  Partials        963      963           

Impacted Files	Coverage Δ	Complexity Δ
...walking/oap/server/core/query/LogQueryService.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ng/oap/server/core/storage/query/ILogQueryDAO.java	71.42% <ø> (ø)	3.00 <0.00> (ø)
...kywalking/oap/query/graphql/resolver/LogQuery.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...rage/plugin/elasticsearch/query/LogQueryEsDAO.java	2.63% <0.00%> (ø)	1.00 <0.00> (ø)
...ge/plugin/elasticsearch7/query/LogQueryEs7DAO.java	2.63% <0.00%> (ø)	1.00 <0.00> (ø)
...server/storage/plugin/influxdb/query/LogQuery.java	5.00% <0.00%> (ø)	2.00 <0.00> (ø)
...rver/storage/plugin/jdbc/h2/dao/H2LogQueryDAO.java	73.78% <100.00%> (ø)	9.00 <0.00> (ø)
...g/oap/server/telemetry/prometheus/BaseMetrics.java	96.77% <0.00%> (+3.22%)	10.00% <0.00%> (ø%)

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