修复重复重建es索引bug

[liangliangyy]

No description provided.

[coveralls]

Coverage increased (+0.2%) to 81.217% when pulling 3fe1124 on dev into 70afcb7 on master.

[codecov]

Codecov Report

Merging #326 into master will increase coverage by 0.23%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #326      +/-   ##
==========================================
+ Coverage   80.98%   81.21%   +0.23%     
==========================================
  Files          50       50              
  Lines        2061     2055       -6     
==========================================
  Hits         1669     1669              
+ Misses        392      386       -6

Impacted Files	Coverage Δ
DjangoBlog/elasticsearch_backend.py	0% <ø> (ø)	⬆️
blog/documents.py	73.77% <0%> (+2.34%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 70afcb7...3fe1124. Read the comment docs.